Whopee Cushions Never Get Old....

My friend Rachel got me a whopee cushion for my b-day. It's one of those self-inflating ones, which make it oh-so convenient to keep having fun over and over again! I brought it to work and the sheer delight of my coworkers over this child's toy is hilarious. One guy - it didn't matter how many times I "flarped" it or how close of a "flarp" it was to the last "flarp - laughed EVERY single time I did it. It just doesn't get old!

OK, so what other stupid toys just don't get old? Any ideas?