Jeeeze, man, learn to give a punchline. :) Answer: the porcupine has the pricks on the OUTside. [roll eyes] (one must state an obvious , which leads to the listener coming up with the "joke" him/herself.....) Try again........ larry sandiego16v So, Mike, what's the difference between a porcupine and a BMW? . . . . . The BMW has the pricks on the inside. ba-dum-bump