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The Germans are a serious bunch.

They produce some of the world's best-built, most-reliable and most-potent machinery around.

Naturally, with all of this professionalism comes a serious attitude. So when we heard AMG – Mercedes-Benz's performance tuning division – had created a special Christmas video, we weren't expecting much if we're honest. Some rather shouty German engineers shouting at some equally shouting AMG sports cars.

But we were wrong – really very wrong in fact. The video below starts off as you would expect it to, but by the end it's a very different film.

We won't ruin it for you but it really did put a smile on our faces. Merry Christmas!