I once heard someone with the trigraph EBC call up "Eggy, Barley, Charlow"; it's twenty years ago and I still chuckle - easily pleased.
XKE was almost guaranteed to trip me up.
VKZ wasn't much better.
I'm easily tripped up, though.
Off thread slightly but tied into a post above I do remember a morse instructor who had a stutter (not in morse, you understand, hence his liking fot it) who informed me that the morse for a comma was dah, dah, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, di, dah, dah.