Use real fishing rods to hook little ducks floating round a large half-barrel of water. The barrel is painted in bright fairground colours and lined with waterproof sealant. Also included is a ‘hook-the-duck’ ground sign to match the paintwork on the barrel. Hire this for £30.
Mousetrap! I used to set it up (never following the board game) and it was always a 50/50 whether it trapped the mouse or not. Possibly could have made money on it by getting friends to place bets. Another example of me not maximising my opportunities.