Now You Can 'Call Shotgun', Literally
Alexander Reh designed the 'Fully Loaded' chair awhile ago, but now has 30 available for purchase. You have to contact him for pricing information though (read: they're expensive). Each contains 450 .12 gauge shotgun shells, and are allegedly comfortable. If ammunition really close to your a-hole is your definition of comfort.
Two more pictures if you pull the trigger.
Shotgun Chair [electroplankton]