"You're actively trying to get me to bang my head against this table," Severus tells him, "but I don't think it's been washed recently."
"Yes, your aim is terrible," Severus agrees, straight-faced. "I think we've all seen that demonstrated here tonight."
"You really want to eat what they'll be serving here?" Severus asks, eyebrowing, and adding sotto voice, amused, "So soon after a steak and a piece of cake which were each the approximate size of your head, to say nothing of the chips?"
Oh noes! Do you have any of the old soap left, or benadryl? I had that kind of reaction to one of those tester tubs at I think the Body Shop at the mall, and just washing it off helped soooo much.