Everyone list your physics jokes here. I have a few ones. In the early 1900's, name foreigners came to america, and they had bad english skills, espeicaly with tense and past tense. So, one day, a german who just entered the country lost track of the time, as he needed to catch a train , so he asked a physicists "What is time". The physics replied "You will have to ask a philosopher that question, I'm only a scientist". Your mother is so fat, men are actually attrracted to her, according to General Relativity. Don't take these jokes offenseively, these are jokes that only we can understand.