After reading about solitary confinement I wanted to test myself by staying in the bathroom in my finished basement for a weekend. I'd have sunlight through a small window, a toilet, sink, and would have my wife bring me meals 2-3 times a day.
I figured this was pretty similar to real solitary confinement with the main differences being I'd be sleeping on the floor and could leave at any time.
Unfortunately she refused to participate so I never did it, but I'd like to think I could have easily competed it.