If You're Happy and You Know It

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If you're happy and you know it stomp your feet * * 

If you're happy and you know it slap your knees * * (for kids sitting cross-legged) 

If you're happy and you know it shout "Hooray"  * * (or "More Beer" if playing in a bar)

The 3d line can also be played as:
    If you're happy and you know it then your face will surely show it
 

You can also play this in bars.  You might even try some new words:
If you really want to show it...

drink some beer,
buy some beer,
leave a big tip for that really good looking wiatress who's been putting up with your crap all night,
kiss your girlfriend,
beat up your buddy and kiss his girlfriend,