Two eps - the finger-on-chin, dancing Chekov is from I, Mudd (increasingly insane behaviour to overload the logic circuits on an android guard) and the Kirk/Spock fandango is from Plato's Stepchildren - they were actually forced to dance by psychokinetic powers in a classic case of Aliens Made Them Do It :D
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*rolling about on her living room floor* THAT IS THE FUNNIEST DAMN THING EVER!!!
I WANT to know in which episode they were all dancing like fools!
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(they also made kirk snog uhura. Oh the HUMANITY)
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...even though it isn't responsible for the best Trek gags ever...*cackles at Malcolm and Trip and the bourbon*
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*sniffs disdainfully at the sheer cheek*
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