Link (via Schneier)
U.S. Patent 6844817, Aircraft anti-terrorism security system, by Wolfgang Gleine. Issued Jan 18, 2005.
Problem: Terrorists want to hijack a plane by trying to break down the cockpit door.
Solution: After hardening the cockpit door, airlines should add the next logical step: airplane trap door that springs open to entrap terrorists below deck.
Bonus: Great prank to pull on the co-pilot going on a bathroom break.
Improvement Suggestion: Add an alligator pit to the trap door ...
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.