I wasn't working for this resturaunt at the time but someone understood what my shirt meant and wanted me to do a trick.
I walked to the table and started performing spongeball magic, everything was fine until I accidently made a ball drop into someone's spaghetti (SP), needless to say they didn't really want anymore magic and I CERTAINLY practiced at it more. This was like a year ago though.
Good time for a good out: "There you go, it looked like your spaghetti did not have enough meatballs already, that one is on the house."
Well, you see... I wasn't really expecting it, I was still rather new and when it fell it was just sort of like "oh snap... what now?" Needless to say I blushed, grabbed it, apologized, and walked away. Nothing else came to mind, though I should have made some sort of quick response like you gave me.