One of my favorite stories that my grandfather always used to tell was about a snail who painted a great big "S" on his car ...something to the effect (care of the Net, with a small brand tweak) of:
A snail saves up all his money and buys a brand new Mini. Just before he leaves the garage he says to the guy, "Just one more thing, Could you paint a great big 'S' on the side of the car for me?". The guy in the garage says, "Sure, but why do you want to ruin this beautiful paintwork with a giant letter 'S'?". The snail says, "So that when people see me driving past they'll say 'Look at that 'S'-car-go!"!!
Ok, so its told a hundred different ways (like this variation or this one, etc) but when Grandpa told it it always got a laugh from us!