Pace it again, Sam

Dr. Franklin laughed.
“Sam is so gullible, you can drop him in a padded round room, tell him the door out is right around the corner, and he’ll wear himself out looking for it.”
Dr. Franklin turned on the speaker for the chamber’s locked hatch. “Found it yet, Sam?”
I tapped Dr. Franklin on the shoulder. “I think so.”
Dr. Franklin gasped. “But… how… Sam… did… where…”
“Look for yourself,” I said.
Dr Franklin spent the next six years pacing that round room. “I know it’s here somewhere, Sam.”
I’d show him, but it would only make him even crazier.