Thought I'd kick off with this one:
At uni I ended up sharing a house with four girls, who all had longish hair. Their hair must have been falling out and filling up the plug hole in the bath, slowing the water drainage. One morning, I'd had my 'usual' shower routine. However, it was then decided it was time to unclog the plug and everyone seemed to enter the bathroom to watch as a hair clip or tweezers were used to pull out tangled masses of hair,stuck together with a glutenous substance. "It must be soap," the girls said, as they pulled out more and more coated hair with their bare hands. It wasn't. I scurried away and left them to it.