Balloons

Balloons are interesting in that they don't really serve a purpose. People tend to buy them, blow them up, have them sit for about a day, then pop them. So what you are really doing is buying a bunch of trash that requires work to look good, and have the desired temporary happy-looking effect. But what is even weirder about balloons is that the longer you take to clean them up, the easier it gets. This is completely different from most forms of trash, where if you don't clean it relatively quickly, it can get much worse. But if you just let balloons sit, they lose air, and become much easier to dispose of.