My introverted kids could have cared less about being grounded. Send me to my room where my books and lego are? Yipee! My extroverted kids felt that being grounded for an afternoon was akin to being drawn and quartered.

Me. My sister. My poor parents, grounding just wasn't a punishment. At one point my mom lamented that they can't very well take away books and paper as punishment for me. On the plus side... I was never really bad in the first place so I didn't get grounded much.
I remember that as a very small sprout, the teacher would "punish" the glass by denying us recess outside. "We're turning the lights off and you'll all put your heads down on your desks for a half-hour!"
Oh gosh, oh golly, no, please no...please...(*yawn*)...no...