I recall reading that the microwave oven was invented by a physicist after he walked by a radiation chamber and the chocolate bar in his pocket melted... makes me wonder if there was any historic license taken in that case as well.
That one I could totally believe. Radar equipment + chocolate bar = very likely to occur.
The main problem with that one is chocolate bar + body heat also leads to melting.
Please compare a chocolate bar after 30s in your pocket and 30s in your microwave.
Are you in the microwave for 30s too?
The trick to actually melting chocolate in a microwave is to do it in pulses of only a few seconds, see if it stirs yet, and repeat. Longer runs will quickly destroy it.
Any reasonable person could distinguish between a chocolate bar that melted in a pocket, and one that is fresh from a microwave heating.