I'm a jumpy dude by nature, my mom says that's because my dad thought it was hilarious to scare me in her stomach and watch me move.

Somebody posted a clip of a guy who is so surprised by his own surprise party, that he instinctively pulls out his gun. He seemed to be startled by the sound of a balloon popping as he entered the house.

Once he realized what was happening he put the gun in his pocket and started greeting everybody.