My wife did this last night. I had to inside early, and she wanted to wait in the car and follow me later. I didn't worry because I "knew" she had her phone with her and didn't think to warn her. It was a concert, so she wanted to silence her phone, and turned on Airplane mode...so when she opened the door the "Frankenstein" music blasted her, and she had no clue how to turn it off. Unfortunately, the things that the Tesla does "automatically" simply do not make sense to her, no matter how many times I explain. I may have to buy her a fob to make her happy, but I really hate to spend that much on it.