Name something you can put in balloons?
Call their parents and ask to come over some time to decorate their room with balloons. Leave a note instructing them to pop all the balloons. Leave a note in one of the balloons that says will you go to sadie's with me? then in another balloon put ur name. in the other notes put things like keep trying! and wrong balloon sucka!
Uh...You pop the balloons? You can't mean that (at least I hope not). Perhaps you mean something like "get the helium out and save it." Pop the balloons in a confined (airless) space. Of course, then all you have is room full of helium. If you want to put it into a tank, you'd need huge compressors and heat exchangers. Quick quiz: If you're driving a truck with a load of birds in the back…