The Porridgey-Didge fiasco. What was supposed to happen: Amanda was sitting on a chair that would be incling until she fell into a vat of porridge. But she managed to hang on after Shaun managed to incline the chair all the way, so he decided to let her go... until Josh suddenly ran over and threatened to push her in. (He didn't).
The various guests delivering the Endgame envelope including Justin Bieber's carpet, a block of ice, Ziggy the world's tiniest zombie, Herbie the love bug, a zebra disguised as Scarlett Johannson, the inventor of Sudoku in a broken bumper car, and many others.