Sample text which makes apache2 segmentation fault (from forum I own):
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[/img]
Are you using Windows? In windows, you are likely encountering a stack overflow. You can add something like the following to your Apache config:
<ifmodule mpm_winnt_module="">
ThreadStackSize 8388608
</ifmodule>