Um...I have done that before. It gets all sparkley, and leaves burn marks inside the microwave. It might do more than that if left in there longer, but I never tried, since it was already starting to damage the microwave.

So I don't understand this meme. Is there a newer kind of microwave that can handle aluminum foil safely that I just don't know about? Or am I just too much like an NPC to get the joke?

Just a silly joke. But if you're up to challenge, try to replace the tinfoil for a couple of grapes touching each other.

https://www.youtube.com/watch?v=wCrtk-pyP0I