"Place me behind prison walls—walls of stone ever so high, ever so thick, reaching ever so far into the ground—there is a possibility that in some way or another I may be able to escape, but stand me on that floor and draw a chalk line around me and have me give my word of honor never to cross it. Can I get out of that circle? No, never! I’d die first!"
I confess that I've always found this hilarious. I applaud the honesty, but would like to offer a few additional suggestions for the person mind-bogglingly stupid enough to draw a circle on the ground and then promise never to leave:
* Lock yourself into the bathroom and then promise on your honor never, ever to go outside again, even for food.
* Promise to never, ever eat anything other than marshmallows for as long as you live (approximately two weeks by most estimates).
* Place your hand on a warming stove-top and then promise to never, ever raise it again.
Just a thought. You don't have to constrain yourself to the whole "starve to death in a circle" thing. Be creative.