OK, ON February 10th, 2009, Iron maiden was playing in Belgrade, Serbia.

When the boys were supposed to start playing "The Trooper", Adrian accidently started playing wasted years.

Bruce noticed in a heartbeat, and yelled at Adrian, telling him, "Get you eyes Fuccking checked!"
Adrian looked at the setlist on the ground, and immeadietly they started playing the trooper.

You can find this on youtube, its SO funny!