Beep...beep...beep

Yesterday I was at Costco in the parking lot looking at my list. I had stopped in front of an SUV and all of a sudden the vehicle started beeping at me like I wrote in the title "beep...beep...beep" and I thought this car is beeping at me for standing so close! So I moved away. Then I saw a man walking up and realized he had just been unlocking his car.