The above post/thread was a nice revelation, since it mentions that it mostly happens to women as a result of showering, because it's a wet-long-hair thing (my hair is about 2 foot long IIRC). Since reading it, I've tried to be more careful in the shower; I'm 6' and have to lower my head to get it fully under the shower, so I try to remember to bend at the knees instead of tilting my head back.
Yesterday, I got a call that someone was picking me up for lunch, and cranked through a quick shower in five minutes or less. Today I am experiencing the oh-so-wonderful experience described above. Oops.