Giovanni Ribisi
Giovanni Ribisi is a familiar face for a reason, he was Phoebe's brother! Frank Buffay Jr. appears in nine episodes of the show as Phoebe is carrying the child of him and his infertile wife. Without him, we'd have never gotten the line "I’m having my brother’s babies!"
Jill Goodacre
Jill Goodacre got the exciting role of playing herself in an iconic episode of the series. Trapped in an ATM area, Chandler finds himself alone and nervous beside the supermodel. He tries to play it cool, but he chokes (literally, he coughs up his gum!).