In his short time as host of The Tonight Show, Jimmy Fallon has made it a point to use many of his best and most popular reoccurring Late Night bits. Last night, he brought back “Bill Cosby shows up and acts like a lunatic.†Cosby did the three bits below – acted confused about what show he was on, made fun of bungee jumping, and tightrope-walked with Jimmy on his back – and basically never sat down. He had nothing to promote, except his next time on The Tonight Show.