When a goalkeeper is injured the game engine draws a portculis over the goal and places tank traps in defensive positions. If you are watching and you actually replace the goalkeeper it tilts the pitch up and everything rushes to the new GK, who is bound and gagged.

Also, if you fall off the edge of the world the space monkeys catch you, rub mbimba mbimba tree sap on your feet and plonk you back down facing a north easterly breeze. Unless its Tuesday, you don't ever want to go to the edge on a Tuesday. O.o