It's too hard to choose, so I'll just name some of the funniest.

Felix having Oscar on the witness stand, and asking him questions. (The Odd Couple)

Ricky trying to read a book that has a bunch of words that end in ough, and are all prounounced differently in English (I Love Lucy)
Golf (I Love Lucy)
Ralph and Ed do a commercial (The Honeymooners)
Jim's driving test (Taxi)


There are others worth considering, and I might have forgotten some, but these are the ones that jump to minds. There are also things I might consider for very funny scenes but not quite as funny as these. All of these can always make me:rollin