The word toe, in various forms is often my undoing. Flaming toe, hairy toe, stinky toe and, once, Chinese toe. Crap. I've started giggling.
Other words and phrases that have undone me are: gimpy Neno, Nick Testicockulese, Pat McCrotch, wang, mandingo, "maybe the dingo ate your baby", moosage, "don't gnaw on my beak", "what about that gnarly old goat dude?", "you killed Ted you medieval dickweed!", "funny, she didn't look druish!", pork, schwing, Schwinn, nobgoblin, nob polisher, wanker, chupacabra and pants.
Lord, I've started laughing. I can barely type. Okay, I'm done. There have been times when I've been set off while driving and I have had to pull over.
Oh man, nobgoblin keeps making me giggle. I'd better stop this entry before I laugh myself straight out of my chair, which, sadly, wouldn't be the first time.