It looks the same the world over

Apparently the reason why there is so much misunderstanding between people of different races/cultures is that the facial expressions are different (along the lines of don't smile at monkeys because to them the baring of teeth is an agressive signal). But you know, there are some expressions that look the same no matter where you come from and what you look like.

Whilst I was sitting in an asian restaurant last night waiting for my take away order, I was watching an asian family - a bowl of pho (Vietnamese noodle & stuff soup) was put in front of the young girl (about 16 or so) and she was telling her how to eat it, and then another bowl of pho was put down behind the first one, and they looked at it in puzzlement, and called the restaurant people and the first bowl was taken away. The looks that were on the woman and girl's faces were priceless (having been in a similar situation myself at times) and I realised that there are some expressions that look the same the world over.
WTF is definitely one of them.