Ahhhhh. The possibilities. You can just sneak up on somebody and play the alien beeping sound and watch the look on their face. (Tested on my dad, with very entertaining results. He screamed and was about to run out the front door when he saw me.) Just click all the different sprites, sit back, relax, and enjoy the entertainment.
Credit to my BFF who came up with the alien noise. (A ship zooming by, then a crash, then an alarm.)