Nothing bad at least. Maybe a slightly annoyed comment, but usually the pictures turn out to be quite funny, since I am in the middle of eating.

Once we ordered two cappuccino, they came with latte art. Just when she was about to take a picture of her cup, I stirred it with a spoon :D.

The reaction was priceless, but I was smart enough to not touch my cup, so we just swapped and i didn't do it again. Absolutely hilarious though.