A man is trapped in a room.
In the room their is a table, chair, 2 doors, and a small hole in the ceiling 12 inches in diameter.
Behind one of the doors is an extremely hungry lion that hasn't eaten in a couple of days.
Behind the other door is a glass tunnel that magnifies the sun creating temperatures so high that even opening the door could kill you.
How does the man escape?
He waits for the night and then escapes through the door having the glass funnel.