I keep alternating between two different ones.

First: hubby and I found this last week when we were talking about maybe getting a hedgehog. It's freakin hilarious, but it does get stuck in your head.

YouTube - Boogie Boogie Hedgehog - Parry Gripp

Second: Hubby found this one a long time ago, but he started singing it last night, and now I can't get it out of my head.

YouTube - Robot Parade