diff --git a/CHANGES b/CHANGES
index af3c4752..fbde1e2a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -54,6 +54,9 @@ Release date to be decided.
 - Added `message_flashed` signal that simplifies flashing testing.
 - Added support for copying of request contexts for better working with
   greenlets.
+- Removed custom JSON HTTP exception subclasses.  If you were relying on them
+  you can reintroduce them again yourself trivially.  Using them however is
+  strongly discouraged as the interface was flawed.
 - Python requirements changed: requiring Python 2.6 or 2.7 now to prepare
   for Python 3.3 port.
 
diff --git a/flask/ctx.py b/flask/ctx.py
index a02c9a86..320f2f0e 100644
--- a/flask/ctx.py
+++ b/flask/ctx.py
@@ -9,6 +9,8 @@
     :license: BSD, see LICENSE for more details.
 """
 
+from __future__ import with_statement
+
 import sys
 from functools import update_wrapper
 
diff --git a/flask/exceptions.py b/flask/exceptions.py
deleted file mode 100644
index 83b9556b..00000000
--- a/flask/exceptions.py
+++ /dev/null
@@ -1,48 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    flask.exceptions
-    ~~~~~~~~~~~~
-
-    Flask specific additions to :class:`~werkzeug.exceptions.HTTPException`
-
-    :copyright: (c) 2011 by Armin Ronacher.
-    :license: BSD, see LICENSE for more details.
-"""
-from werkzeug.exceptions import HTTPException, BadRequest
-from . import json
-
-
-class JSONHTTPException(HTTPException):
-    """A base class for HTTP exceptions with ``Content-Type:
-    application/json``.
-
-    The ``description`` attribute of this class must set to a string (*not* an
-    HTML string) which describes the error.
-
-    """
-
-    def get_body(self, environ):
-        """Overrides :meth:`werkzeug.exceptions.HTTPException.get_body` to
-        return the description of this error in JSON format instead of HTML.
-
-        """
-        return json.dumps(dict(description=self.get_description(environ)))
-
-    def get_headers(self, environ):
-        """Returns a list of headers including ``Content-Type:
-        application/json``.
-
-        """
-        return [('Content-Type', 'application/json')]
-
-
-class JSONBadRequest(JSONHTTPException, BadRequest):
-    """Represents an HTTP ``400 Bad Request`` error whose body contains an
-    error message in JSON format instead of HTML format (as in the superclass).
-    """
-
-    #: The description of the error which occurred as a string.
-    description = (
-        'The browser (or proxy) sent a request that this server could not '
-        'understand.'
-    )
diff --git a/flask/json.py b/flask/json.py
index 7777ba5d..22f6067d 100644
--- a/flask/json.py
+++ b/flask/json.py
@@ -17,7 +17,10 @@ from werkzeug.http import http_date
 
 # Use the same json implementation as itsdangerous on which we
 # depend anyways.
-from itsdangerous import json as _json
+try:
+    from itsdangerous import simplejson as _json
+except ImportError:
+    from itsdangerous import json as _json
 
 
 # figure out if simplejson escapes slashes.  This behavior was changed
diff --git a/flask/testsuite/helpers.py b/flask/testsuite/helpers.py
index d0054de1..21c9f791 100644
--- a/flask/testsuite/helpers.py
+++ b/flask/testsuite/helpers.py
@@ -33,23 +33,11 @@ class JSONTestCase(FlaskTestCase):
         app = flask.Flask(__name__)
         @app.route('/json', methods=['POST'])
         def return_json():
-            return text_type(flask.request.json)
+            return flask.jsonify(foo=text_type(flask.request.json))
         c = app.test_client()
         rv = c.post('/json', data='malformed', content_type='application/json')
         self.assert_equal(rv.status_code, 400)
 
-    def test_json_bad_requests_content_type(self):
-        app = flask.Flask(__name__)
-        @app.route('/json', methods=['POST'])
-        def return_json():
-            return text_type(flask.request.json)
-        c = app.test_client()
-        rv = c.post('/json', data='malformed', content_type='application/json')
-        self.assert_equal(rv.status_code, 400)
-        self.assert_equal(rv.mimetype, 'application/json')
-        self.assert_in('description', flask.json.loads(rv.data))
-        self.assert_not_in('<p>', flask.json.loads(rv.data)['description'])
-
     def test_json_body_encoding(self):
         app = flask.Flask(__name__)
         app.testing = True
diff --git a/flask/wrappers.py b/flask/wrappers.py
index 5f4e74a3..d70e7022 100644
--- a/flask/wrappers.py
+++ b/flask/wrappers.py
@@ -11,8 +11,8 @@
 
 from werkzeug.wrappers import Request as RequestBase, Response as ResponseBase
 from werkzeug.utils import cached_property
+from werkzeug.exceptions import BadRequest
 
-from .exceptions import JSONBadRequest
 from .debughelpers import attach_enctype_error_multidict
 from . import json
 from .globals import _request_ctx_stack
@@ -105,21 +105,16 @@ class Request(RequestBase):
     def on_json_loading_failed(self, e):
         """Called if decoding of the JSON data failed.  The return value of
         this method is used by :attr:`json` when an error occurred.  The default
-        implementation raises a :class:`JSONBadRequest`, which is a subclass of
-        :class:`~werkzeug.exceptions.BadRequest` which sets the
-        ``Content-Type`` to ``application/json`` and provides a JSON-formatted
-        error description::
+        implementation just raises a :class:`BadRequest` exception.
 
-            {"description": "The browser (or proxy) sent a request that \
-                             this server could not understand."}
-
-        .. versionchanged:: 0.9
-           Return a :class:`JSONBadRequest` instead of a
-           :class:`~werkzeug.exceptions.BadRequest` by default.
+        .. versionchanged:: 0.10
+           Removed buggy previous behavior of generating a random JSON
+           response.  If you want that behavior back you can trivially
+           add it by subclassing.
 
         .. versionadded:: 0.8
         """
-        raise JSONBadRequest()
+        raise BadRequest()
 
     def _load_form_data(self):
         RequestBase._load_form_data(self)