Totally agree and if your four year old has never been to a drive in theatre, this is the chance to talk about how things were "back in the day" (although maybe you haven't been to a drive in either

). The film clips are harmless so if your son can do T-Rex, he can see the show. I will caution that you sit in cars that seat two people comfortably in one row so one adult might need to be in front or in the back of the other but we've eaten here with six adults and have been able to talk to each other through the meal.