Our youngest grandson just turned two and is a HUGE "five little monkeys" fan.  He's been watching different versions of the song on YouTube for the past 6 months and is pretty much addicted to them - ha.  His latest trick is to quickly glance around whatever room he happens to be in, find something to climb up on, and then start singing the song and jumping off whatever he climbed up on at the appropriate moment.  Of course he climbs right back up because he has to play the part of all FIVE monkeys, naturally!