Should You Use Mayonnaise on Grilled Cheese Sandwich?

There's a BIG debate and I mean BIG (well, we are all stuck inside with a lot of time on our hands. lol) But a blogger recently posted an article stating that under NO circumstance should a Grilled Cheese Sandwich be made using mayonnaise instead of butter. Well, the response was crazy. TONS of people said she was wrong. They love it and say it brings the sandwich to a whole new level. As you an imagine this has now set the internet a flutter with people chiming in and giving their opinions. I have never tried it before, so I do have to admit it has peaked my interest. Hmmm... have you ever tried it? If not, here's a video that seems to have people's taste buds perked and their mouths watering....