Polish biker During the times of the cold war and the iron curtain, a Pole with a bike and a bag full of sand was crossing the border to east Germany. At the border control point the guard said: \-Sir we need to search your bag for any smuggled goods. They went through the bag and found nothing but sand. This situation repeated for multiple days, with each the guard would get more and more frustrated as he didn't find anything in the bag of sand. So one they he can't take it anymore and says: \-Okay I know you are smuggling something, but for the love of god can't figure out what. I don't care about catching you I just want to know what it is! I'll let you free if you just tell me what it is To that the Pole said: \-Bikes