Not too long ago, I dropped my bike off to have some work done, the wife picked me up and brought me home. A few days later, she, I and our oldest grandson went to pick it up. The plan was for grandson to ride home with me, so we spent an extra minute or two making sure he had some suitable gear before going to the shop. We get to the shop, and all go inside, pay, do a bit of looking at the bikes there, and get ready to leave.
Grandson and I are mounted on the bike when my very upset wife comes over and says she can't open the car. We dismount, walk over to the car, and she hits the button on the door to unlock them. They unlock. She gets in and we head back to the bike. She comes back over, now the car won't start. I walk over again, and ask if she has her keys. She roots through the bottomless purse for a few minutes, and admits they are not in there. I hand her my set, which includes a fob for the KIA, and tell her I will meet her at home. My fob was what worked everything, so she did not realize that she did not have her keys.
A side not about spare keys: I accidentally locked a running tri-axle dump truck at a fuel island. I still have a spare key for that truck now, even though I have not worked for the company for exactly six years. I have a spare for the one I drive now as well, despite it technically being forbidden by company policy.