Q: Will rice cakes blow up if heated in the microwave?
A: Yes. Yes they will.
(For those who are curious as to why one would heat a rice cake in the microwave, it was because I made a mini-pizza out of one with some tomato sauce and soy mozzarella today for my snack. The recipe called for a small pita, but I don't have pita in my house, I have rice cakes. Waste not, want not! I used the rice cake instead, and watched the whole thing real close as it cooked, just in case. It gave a quick "pop!" right as I stopped it from heating, so I was able to avert micro-disaster, but I'm pretty sure had I let it go, there would have been rice cake, tomato sauce, and fake cheese EVERYWHERE in there. Now you know.)