8x05 "The One with Rachel's Date"

Phoebe begins dating a guy who works for Monica, causing a problem when Phoebe wants to dump him on the same day Monica plans to fire him. A guy at Chandler's work thinks that Chandler's name is Toby. Rachel goes on a date with Joey's costar, despite being pregnant, much to Ross' annoyance.
Note: This episode is dedicated to the memory of Richard Cox, Sr., father of Courteney Cox.