Weirdest thing I've personally ever done while sleepwalking(according to my mom), when I was about 6, I sleepwalked(?) to the bathroom to pee. Apparently, while sleep-peeing, I started swinging my penis while singing "Rhinestone Cowboy", creating quite a mess. At least I was in the bathroom. Anyway, after finishing, I returned to bed. Woke up the next morning with no memory of it whatsoever.
Strange things happen when you sleep.