If you're happy and you know it clap your hands. (clap clap)
If you're happy and you know it clap your hands. (clap clap)
If you're happy and you know it and you really want to show it;
If you're happy and you know it clap your hands. (clap clap)

If you're happy and you know it tap your toe. (tap tap)
If you're happy and you know it tap your toe. (tap tap)
If you're happy and you know and you really want to show it;
If you're happy and you know it tap your toe. (tap tap)

If you're happy and you know it nod your head. (nod nod)
If you're happy and you know it nod your head. (nod nod)
If you're happy and you know it and you really want to show it;
If you're happy and you know it nod your head. (nod nod)

(ed: you can make up endless variations on these verses and encourage the kids to make their own - can be loads of fun!)