I am sure I have more than this one anecdote but this one still makes my cheeks pink. And it was almost 20 years ago.
I was working at a summer camp and a few of my fellow counselors were using our day off to see some local sights. One of them had a guy friend visiting and he was cute! So, of course, I was in super-hyper-don't-do-anything-stupid mode. And I suppose you all know where that gets you.
So I happened to be driving and let out a yawn. CuteGuy said, jokingly, something like "Hey, don't fall asleep there!"
Me, being oh, so witty, responded "Don't worry, I'm not a narcoleptic or anything."
Only I didn't say narcoleptic. I said necr0pheliac. Which is slightly different. The really awful part is that the whole time I was showing off my wit, I was mentally telling myself to NOT say necr0philiac.
For some reason, he was really not that impressed with my vocabulary.