You need to feed him things he never even imagined and cannot figure out. Some Tupperware filled with Jelly Bellys. Anything chocolate, I suggest Oreos in a cellophane wrapper. Some cans of Pringles. Pepsi in a plastic bottle. “Sacre Bleu - this glass bends before my eyes! And what wondrous elixir doth it hold?”
Remember that Russian family that hid in the woods during WWII and were not found until 50 years later? Satellites didn’t faze them, they had seen them overhead. They took TV in stride. But they were astonished by cellophane wrappers - “Look, it is glass and yet it crumbles” said the old man.