Silly one my dad told me in childhood So Tom and Terry are walking down a dirt road. ""Watch out Tom you're about to step in poop!"" *Crouching down ""No way, that's not poop"" ""Dude it definitely is! Just look at it"" ""I can't trust your eyes. I'll prove it"" Tom scoops up a handful and shovels it into his mouth. *Chuckling ""Would you look at that. It IS poop! Good thing I didn't step in it!""