I ran across this website that sells T-shirts and a lot of them are quite funny.  Here is a small sample of the ones I liked.  Link to Bad Idea T-shirts

Note: They have a sale going on where you buy 3 and get 9 free.  Wow, we should all get matching T-shirts and start our own club.

 7 DAYS WITHOUT A PUN MAKES ONE WEAK  COMMON SENSE  FLUENT SARCASM