Monkey Island 4 (Escape from Monkey Island) Easter Egg - Guybrush Kills Himself

When you meet the other Guybrush in the Mists of Time in the Lucre Island, the other Guybrush will give you a gun. If you try to use that gun on the other Guybrush, you will shoot and kill him. Real Guybrush will say something like "So, it's true that gun owners usually shoot themselves". Then, a time portal will show up and send you back to the beginning of the swamp.