In my opinion John Belushi playing Joe Cocker is the funniest video of all time.
At Woodstock in 1969 Joe Cocker delivered this performance of his rendition of the Beatles' "With A Little Help From My Friends." Joe Cockers' passionate performance sounded great, but his stage antics are utterly bizarre and ridiculous. Watch this video first.
Now fast forward to the 1970s. John Belushi was a Saturday Night Live Cast member from 1975-1979. In my opinion, the funniest and all-time greatest. He is best known for his work in the film Blue Brothers, but also for the dozens of extraordinarily funny skits he delivered during his 4 year SNL tenure. John Belushi spoofing Joe Cocker's 1969 Woodstock performance is nothing short of absolutely hysterical. He parodies Joe Cocker's antics perfectly, sounding and looking just like Joe Cocker. In fact when one watches both videos in a row, it's almost difficult to tell which one is parodying the other.
Take the few minutes to watch these, starting with the Woodstock 1969 version and then watching the John Belushi version right afterwards. Any time I've had a rough day, I put these on, and I roll on the floor laughing. It is truly one of the funniest musical moments of all time. Rest In Peace John Belushi. A true pioneer and legend.