Glad you weren't burnt!
I once had my laptop on the front passenger seat of the car. Parked and decided to go to the passenger side to take it out. Carefully put my keys in my purse, put my purse on top of the laptop on the seat and got out on the driver's side. Yep - locked the door and went around to the other side only to stop and think where my keys were. Had to go into the office to call my husband (who worked nearby) to come unlock the car. You usually only do dumb things once, but then think up a new one!