Father Christmas Needs A Wee

At each different house that he visits Father Christmas drinks and eats all the goodies left out for him. Before long he really, really, really needs a wee. So much so that he even forgets to leave the presents behind. But he dashes back, delivers all the pressies and flies home at high speed to avoid an embarassing accident . . . there's just one tiny problem . . . he's lost his house key!