What steps will reproduce the problem?

>>> from mock import Mock
>>> m = Mock()
>>> m(1, 2)
<Mock name='mock()' id='139781492681104'>
>>> m.call_args == "foob"
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/wilfred/.py_envs/trifle/lib/python2.7/site-packages/mock.py", line 2061, in __eq__
    first, second = other
ValueError: too many values to unpack

What is the expected output? What do you see instead?

Expected False, got an error instead.

What version of the product are you using? On what operating system?

I'm using mock 1.0.1 with Python 2.7.