In the 1992 film "Batman Returns", Catwoman places a few spray cans in a microwave, hops out of range and the whole building blows up.

"Meow" is right.

The film is set in a realistic universe, but full of fantasy-inspired scenes and magic realism. Therefore, this could very well be based on science, make sense in-universe, or totally made up (I'm not sure what actually would explode).

I've looked up but couldn't find any source of anyone trying to debunk this online... (Mythbusters where are you when I need you!)

Is this scene based on actual science, and if not, what is the in-universe explanation for such a large explosion?