Yes. I remember them doing a bit with paint soaked tennis balls that they were smashing on their head in a choreographed juggling manner. This was when the show first opened so I'd have to guess 92-93.
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http://wiki.answers.com/Q/When_does_john_cena_appear_on_the_tonight_show_with_jay_leno"
No. There is no monetary compensation for what is submitted to The Tonight Show.
Jack Paar hosted The Tonight Show from 1957 to 1962
You can find a list of bands, musicians, and singers that have performed on "The Tonight Show with Jay Leno" here: http://www.squidoo.com/tonight-show-with-jay-leno-bands
No. He was never the host, guest host or even a guest on The Tonight Show.