There are too many to list, but I think two of my favorite episodes are "The One With the Embryos" and "The One With the Prom Video". Embryos had the hilarious quiz show with Big Fat Goalie, Ms. Chanandler Bong, and transponster (THAT'S NOT EVEN A WORD!!!). Prom Video had Ross with a perm ("Lookin' good, Mr. Kotter."), just how many cameras were on you?, he's her lobster, and Rachel and Ross kiss.