Friends had a big old chest freezer, and as a bit of a joke one of them got in and we shut the lid.
All that day learned a valuable lesson in atmospheric pressure. Basically couldn’t get the lid back open and there was about 7 of us gripping the edge.
After 30 seconds of panic, we drove a big screwdriver through the body of it in several places to let air in and equalize pressure.
So when you throw it out, rip the door off so no kid can get inside, which would be a death sentence.