I know there's been a very similar thread to this (and I've looked coddy, I just can't find it ) so apologies in advance.
Last night, after being warned that he would miss the end of a programme because he needed a bath, ds totally lost it when I switched the TV off (he's 6). Lots of pushing, shouting, total disobedience. He was warned that if he carried on, he wouldn't be allowed to go to Beavers tonight. Sure enough, he carried on and so was told that he wouldn't be going.
Of course, this morning he's very sorry and is desperate to go. I knew this would happen and DH and I discussed it last night and our inclination is to stand firm.
Would you?