So there are these "bake at home" pizza crusts you can get at a grocery store here and Jason offered to make us one the other week.
We bought some ingredients and he was slicing them up when he turned and looked on top of the oven... where he'd placed the pizza.... while waiting for the oven to heat up. (Do you see where I might be going here?)
Well, that was the day we learned that even a little bit of heat (ie the heat rising up from an oven pre-heating itself) is enough to start the dough rising!
We barely got the lid off of the container and the pizza didn't quite turn out the way it was meant to but damn if that wasn't a funny few moments of "UH OH!" when he saw the pizza was already well on its way to being fully risen!