emm yeah title says it all :P I'll put one up to start with, the only one I know actually, hence the post. It's bad but thats one of the defining properties of a physics joke right? Heisenberg was speeding, a police man stops him and says, "Do you know where you are?" to which Heisenberg replies, "Why of course, I'm two miles from the Swiss border cutting through the Rhine". To which the policeman replies, "Do you know how fast you were going??"