The final end scene in the 2007 special episode featured a joke from Geraldine (Dawn French) and Alice (Emma Chambers)
A boy was born without a body, no arms, no legs, he was just a head.
So for his 18th birthday his dad takes him to the pub for his first pint. He takes a sip and BOOM - his body pops out. "Take another sip!" everyone shouts, then BOOM - his arms pop out. "Another!" everyone chants, so he takes another sip and his legs pop out.
The boy is really happy and he runs outside in excitement and he's hit by an oncoming truck and killed instantly.