The theory i'm seeing is that it's a way to show that magic can't bring people back from the dead, which makes some sense but when I think about it, the kid in the commercial wasn't able to get the Yo Magic yogurt open and then he died. He didn't die after ingesting it, so who knows.
Edit: Just saw someone mention in the reddit topic who Monica's friend might be...Adam Brashear. Comic spoilers, I guess.