99% of the time, we have the two screen DVD player playing in our van for the kids. And they like to change DVDs often. It’s a pain and if we’re anywhere in a 5 mile radius of home I just say, "We’re almost home and you won’t have enough time to start anything else. We’ll pick a DVD next time we’re in the van." To date, that seems to work.
Today I picked up the girls and S from preschool. S wanted to work the remote which Emma is normally the controller of. In fact, when we get in the van, one of her first questions is usually, "Where’s my remote?" So when S wanted to use the remote today about 2 minutes into our ride home, Emma says, "We’re almost home. I’ll have to do it for now."