There was a time in class, I was sitting next to my friend while fixing a couple mistakes in my HTML, at some point he looked at my screen and said "there's a random nine right here"...
I looked at it, I stopped whatever I was doing and yelled "nein" after he said that, then proceeded to take out the number he was talking about.
I'm actually part German, so I have a /pretty/ good angry German voice... (and Scottish actually, if I'm just a bit annoyed, haha)