Despite what the preparation instruction tells you, do not microwave oat. This is what happens. One might even call it an expl-OAT-ion. (Geddit? Geddit?)
Not only does oat taste nothing like a Big Mac™, it explodes too; which immediately puts it in the "hostile" category for me. I had no idea it would be so risky preparing geriatric meals.
One good thing though. Kudos to the microwave oven people at Panasonic who designed the glass tray deep enough to hold one Grande Starbucks mug-worth of gunk in the event that people's oat explodes. But only the tray got messy. Not the walls. Weird. God works in mysterious ways.
Relax. No animals were hurt.