"I'm gonna kick Chip's ass!"
Roy Gublik appeared in "The One With The Prom Video". He was seen in the video of Monica and Rachel getting ready for their senior prom and he was revealed as Monica's date. According to Monica, he saw Star Wars 317 times and his name was in the newspaper.
After Roy pins on Monica's corsage, we see Monica whisper to Rachel in the prom video. Grown-up Monica tells the group watching the prom video that she had whispered to Rachel that Roy "touched my boob!"