The pressure is on, it's just you and the penalty taker, the ultimate test of nerve - and you save it!
It must feel great, the whole team celebrates on the half-way line - you are the hero. Just make sure the ball definitely didn't go in before you start celebrating yourself.
Otherwise you'll end up looking like this guy. Reportedly filmed in France, the video clip shows a goalkeeper save a pretty poor penalty.
He celebrates straight away - and ends up looking like an idiot.
The ball back-spins sharply and straight into the unguarded net - the referee looks like he takes particular delight as he points back up to the centre-circle and awards the goal.
The very definition of a penalty fail, I guess.
Check it out in the clip above...