Not me
But a friend. Being possessed of an interesting sense of humour and being bored on a sunday afternoon, my friend went out one and thoroughly cleaned a patch of pavement outside his house. He then microwaved a Mars bar until it was soft and gooey, and looked most like a poo. He then placed this imitation poo on the cleaned patch of pavement in an authentic poo shape. He then went back into the house and casually suggested to his housemates that they go for a drink at the nearby pub, which they were very happy to do.

On walking outside the house he then said to his flatmates "Hey, watch this", got down on his hands and knees, and began eating the imitation poo off the pavement, making sure to smear it all over his hands and face.

This would have been funny enough, except that one of his flatmates flipped out at seeing him eat a freshly laid turd and began screaming hysterically, closely followed by repeatedly punching my friend in the face.

Oh how we laughed.
(Robin of the Hood isn't into the whole brevity thing, Sat 28 May 2011, 4:26, 2 replies)

That is just so wrong and funny all at the same time.

(boozehound is drinking your bar dry, Sat 28 May 2011, 6:32, closed)

Navy
I had a friend who served in the US Navy, and he told a similar tale where they thouroughly cleaned a toilet (stainless steel) then put peanut butter on it and, with an unwitting bystander present, ran a finger through it and ate it.
(kitescreech still here, Sat 28 May 2011, 7:26, closed)