I've had a women threatening to sue me because my software caused physical damage to her computer and she needed a completely new system...
After explaining how the problem she was having has nothing to do with her hardware, that it was caused by her miss use of the software, that she agreed to any damage or lost income in the EULA (questionable, I know, but it seems to make the case a little stronger), and that I discovered she was using a copy she borrowed from a friend, she stopped threatening me and was never heard from since.
I thought it was funny at the time, mainly because she actually thought she had a strong case.
