My wife's grandad
Tame compared to some already posted, but here goes:

A few years back he decided that being around his wife was making him ill (i.e. she, and indeed all women, carry some sort of germ) so he moved out of the house and set himself up in the coal shed. At first he only slept out there but as time went on he spent more time there (even had a makeshift kitchen) until eventually she told him to hop it -- just one year shy of 50 years of marriage, they got divorced.

He married again, but pretty soon the same thing started to happen with his second wife so he got a house of his own a few miles away, although they stayed married (and still are, even now he's moved two hours' drive away). He was fairly normal for a while after that, but then decided that all his furniture was infected so he dumped it and replaced it with plastic garden furniture.

He cooks everything from first principles -- he won't eat any processed food (except biscuits) because he thinks it's poisoned (which is probably not that far from the truth, but anyway...). He cleans his clothes with a mop -- the same one he uses for the floors. And he has developed the theory that dust motes are actually matter being created by sunlight.

Then again, he's now 96 and looks twenty years younger, so he must be doing something right.
( reallywittyname veraciously conspues lexiphanicism on, Fri 6 Jul 2007, 10:58, Reply)