Gross habits? →[More:]
I stack my used washcloths, squeezed out and balled up, on the towel rack next to our shower/tub and leave them there until laundry day. They form a nice neat pyramid by the end of two weeks. (It's funny how we don't really "see" these things, if you know what I mean.)
They'll be a prize, by general consensus, for the grossest habit, real or made up. I have worse ones, though, so beware.