This means different things to different people. For me it means get in the car. For my son it means stand on the porch. For my daughter it means lean against the car. I must say it fifteen times between 7:18 and 7:19 am. Get in the car. Standing in entry with door open. Get in the car. Porch standing. Get in the car. On the lawn. Get in the car. Open car door. Get in the car. Fight with legs hanging out of car. And so on.
It wouldn't be such a big deal if we didn't need to leave to meet the bus at exactly 7:20 in the morning. Maybe I need to build in time for differences of opinion on the meaning of the command.