Birthdays - S2.E15

Jodie tell Jeff about a birthday party, He wonders what a Birthday is, and since Jeff wasn't born, he realizes he doesn't have a real birthday and he really wants one. Jodie catches sight of what's going on and her, Sam and Muffy decide to give him a birthday - since they can't remember the date that Jeff was given his magic hat. So they pick that day and try and throw him a surprise birthday party.