Season 2 - 21. The One With The Bullies

Chandler and Ross run into two bullies at the coffee shop; one of whom steals Chandler's hat. After trying to avoid them, the guys confront the bullies and are ready to fight. When a thief steals their stuff, the bullies join Ross and Chandler in trying to get it back. Monica, down to her last few dollars of savings, plays the stock market based solely on the ticker symbols. After she loses it all she's forced to take a job at a 50s theme restaurant where she'll have to dance and wear "flame retardant boobs." Phoebe makes multiple attempts to go visit her birth father and when she finally does, she finds out he's no longer there. She does meet her half-brother, though.