When my son was about 2 I bought him a tickle me elmo and dancing tigrr from the pooh bear thing, pooh bear was great you pressed his hand and he would bounce, layhim face down and looked like he was boofin the carpet.
Then place tickle me elmo in the right spot and with the sounds effects it was a total crackup.. until my son saw it then kept doing it!
Makes you REALLY watch what you do around your rugrats!