Behold, the Vacuum Bazooka!
YouTube / Ri Channel
Would you like to make a bazooka out of household objects, so you may engage in a foam-bullet war with your roommates and frenemies? Of course you would. In this short video, Vacuum Bazooka Specialist First Class (VBSFC) Dave Ansell shows off his vacuum bazooka, featuring increasingly complex loading mechanisms to keep the battle going. Seriously, this is rad:
Take that, neighbors! And thank you, Ri Channel.
If you want to build your own vacuum bazooka, Ansell has posted handy instructions.