I went to a gun show at one of those venues where you can’t carry, even with a CC permit. I unholstered and put a 1911 in the car safe before going in. I quickly reupholstered when I got back to the car (IWB, 4:00).
Later that day I discovered I had accidentally bumped the thumb safety off during the reupholstering process. I put my thumb on the hammer when holstering and make sure nothing touches the trigger, but taught me a lesson to hold onto the thumb safety as well, especially holstering inside a car.