Does anyone else have this problem with their 6YO DC? We limit the tv but do let him watch it. However when we tell him to turn it off because it is time for bed, he goes insane. What do other people do?

Give him a 5 or ten minute warning before the program ends, "You're going to bed when this is over." Then hou need to be clear that if he goes insane, he loses the privilege of watching the next day. And you have to stick to it (even though it's more of a punishment for you if he doesn't watch for a little bit!).