I do. The severity of my punishment depends on what I did. If I snap wrongfully at my parents, I will assign 100 pushups to be done by the end of the day. If I act like an idiot at school or on a message board, I will assign around 300 pushups to be done by the end of the day. If I do something else wrong, such as wrongfully hurt a student badly in school, I will assign about 300-500 pushups, and if I do something severe, I will assign 1000 puhups or more.
Pushups aren't the only thing, though. I tend to punish myself by inflicting pain on myself, thogh without harming myself. One such example was one night I commited insubordniation amongst my parents, so I restricted myself from bringing my GameBoy to the restaurant we were eating at for dinner, restricted myself from eating dinner that night (I told my parents I wasn't hungry as an excuse) and I forced myself to double-cross my legs during the whole 1-hour dinner session at the restaurant. Near the end of the hour, it felt like someone had taken an extremely hot branding pole and seared it right into my skin, it was so painful.
So, yes, I do punish myself, I do it for discipline, of course. But you don't want to be ridiculous when you punish yourself or otherwise you might wind up injuring yourself- not a good thing.
Does anyone else here ever punish themselves?
Anyone who still plays Halo PC (not CE) can join my server titled:
MASS CTF WAR MODDED (i7 server)
My username's Ultrafrigid. It's not a dedicated server, so it won't always be up.