When they are all trying samples of wedding cake, Robbie picks one off the plate and there is one left. They show it again and there's none left and they cut back to it again and there's one left!
There's actually two left, he gives one to the lady standing behind him, and the odd thing is that when they show the plate, it's empty when it still should have a piece on it. The piece that's on it later is the remainder of what he gave to the lady.
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