My brother and sister went through a phase of refusing to go to bed. They would simply go to my mother's room, curl up in her bed and watch TV when told to go to bed. Unless you went up to check on them you'd not know because of the "U" shape nature of the house (two staircases, one at each end to access different areas of the house).
Several checks later, then moving to their own rooms, then sneaking back into mums room because hers had a TV in it,my temper finally got the better of me.
I told them quite clearly that if they didn't go to bed I'd ' break the TV '.
They tried calling my bluff... I stormed out after turning the TV off and unplugging it, down to the kitchen, picked up a pair of scissors. Yelled they had one more chance and went back up to find they had plugged it back in, and we're watching it again. So I yanked the plug out of the wall, counted to 10 (mostly to get rid of residual energy...) and proceeded to cut the plug off the TV as close to the plug end as possible. Then handed them the plug, their faces were a picture, and walked out and went back downstairs to my mother in the sitting room. Explained as crying broke out upstairs. Needless to say they then went to bed. I didn't "fix" the TV for a couple of nights. After that they didn't argue with me again. Neither of them can wire a plug even to this day!