Yeah you can. I've done it plenty of times. It keeps the area that's covered from cooking. I wouldn't recommend using a lot of foil, but it is able to be used.
Ummmm.... either you have a different kind of microwave or you're using a different kind of foil.
Putting regular foil in a regular microwave is NOT safe. I've done it a couple of times (by mistake) and uhhh... nah, I'm gonna have to disagree with you on that one, buddy.

HAVE YOU EVER.... fallen asleep during a church as an adult?
Yes, I have fallen asleep and I have also closed my Bible, crossed my ankles, put my head down and went to sleep willingly.

Have you ever witnessed a bad car accident right before your eyes?