Built in Butt Cushion in you Pants

I went to two football games and some church functions that were hard on my seat.  Basically I spent 10 hours on a metal seat this weekend.  I really could have used built in air cushioning in my pants.  You could hook up a CO2 cartridge to a bladder that would blow up with the push of a button.  It would make you butt look inflated but I think you could get away with it, especially in church.  Then when you were done with the cushion you could press a release valve and let your weight empty the bladder.