If a friend cracks a corny joke, do you force yourself to laugh politely? What about if it's your boss or teacher? Do you get annoyed if someone else pretends to be amused?
Usually, I'm the one making the impossibly corny jokes for the cheap pops. *insert goofy Mick Foley grin and thumbs-up here*
Guess I owe it to Norm MacDonald from Weekend Update. That was often the best part of SNL growing up, and I was hooked on that one segment years before Craig Kilborn perfected the idea with The Daily Show. Norm would be given the jokes too terrible for anyone else to pull off, but somehow he'd make them work. When someone busts out with a lame one around me, normally I try to one-up them with something even worse...something to outright terrible that you get those same kinds of amused groans.
Not so much with bosses, though. When they do or say something stupid I just stare at them blankly. (Trust me, I've got quite a bit of practice...)