Disappointment but still included

OK here's the theory of how to get your humble squeesy tomato sauce bottle to explode.

Firstly you need a bottle that is down to the last few squirts. Take the bottle and ensuring the remaining tomato sauce is at the bottle of the bottle throw in the freezer with the lid open. The cold dense air should now fill the bottle. Carefully remove the bottle and stand lid down in the fridge. The tomato sauce will defrost and drop to the lid to create a seal. The cold dense air will expand and create pressure. When someone takes the bottle from the fridge to use it it should explode tomato sauce everywhere.

Well we tried it FIVE times, even leaving the bottle in the hot sun to maximise the pressure and all we got was a damp pissst. A great theory and if anyone can get a movie file of a tomato sauce bottle bomb working we'd be very interested. Ah well back to the drawing board.