What were you doing when you were 17? Not shocking Mats Hummels I bet.
It's always annoying when you're playing against someone who is way younger than you and makes you look like a right idiot, and the younger they are the dafter you look.
But when Borussia Dortmund faced off against Norwegian side Odd, the German side weren't expecting many surprises from their Scandinavian opposition who have a 41-year-old playing them.
However, they really weren't expecting to be three goals down after just 22 minutes and having some unknown winger shredding their team apart.
While Dortmund managed to pull off an incredible comeback and win 4-3, with Pierre-Emerick Aubameyang netting a brace, that wasn't the biggest surprise of the evening.
During the post-match interview, Mats Hummels said he was very impressed with the unknown winger and said he was very dangerous. However, he was even more impressed when he found out the winger, identified by the interviewer as Rafik Zekhnini, was just 17!
His reaction is absolutely priceless.