In college, there were about 30 people who lived in my dorm, myself included, who carried these around in the dorm on weekends looking for any of our similarly-armed colleagues to ambush with tiny, yellow pellets.  It didn't matter if we had other stuff to do on those nights or during the day or whatever, or if we had just got back at 3am from some drunken blowout, these and the guns that discharged the little plastic discs were all over the place.  It was not uncommon, especially on rainy weekends, to hear or see or be a part of roving firefights through the hallways and lounges with these things.  

...reminds me a little bit of the movie T.A.G.: The Assassination Game.  That's probably where we got the idea for using these goofy, medium-velocity pellet dispensers, only in a less organized manner.  Wandering around the dorm, one could easily find a few of these pellets in corners and in stairwells.