Python, 33 characters

>>> import ctypes;ctypes.string_at(0)
Segmentation fault

Source: http://bugs.python.org/issue1215#msg143236

##Python, 60 characters

>>> import sys;sys.setrecursionlimit(1<<30);f=lambda f:f(f);f(f)
Segmentation fault

Source: http://svn.python.org/view/python/trunk/Lib/test/crashers/recursive_call.py?view=markup

This is the Python version I'm testing on:

Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) 
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin

In general the Python interpreter is hard to crash, but the above is selective abusiveness...

Python, 33 characters

>>> import ctypes;ctypes.string_at(0)
Segmentation fault

Source: http://bugs.python.org/issue1215#msg143236

Python, 60 characters

>>> import sys;sys.setrecursionlimit(1<<30);f=lambda f:f(f);f(f)
Segmentation fault

Source: http://svn.python.org/view/python/trunk/Lib/test/crashers/recursive_call.py?view=markup

This is the Python version I'm testing on:

Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) 
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin

In general the Python interpreter is hard to crash, but the above is selective abusiveness...