Went to the wrong airport to collect a then boyfriend. He rang me to ask where I was because he couldn't find me. Long story short... I thought he had flown to Birmingham, not East Midlands airport!
Mad dash back up the motorway to collect him.
I forgot to put the handbrake on and my poor mini did a runner and ended up at next door's garden wall. No damage to the wall but mini's backside needed panel beating.
More recently I went for a walk with my former sister in law and her friend, who were visiting me. We went in 2 cars because they wanted to hit the road afterwards. SIL dropped her phone in the river when her friend overbalanced on top of her. We got in, gave up, then I went in again and found it by sheer luck. Later I put my rucksack down to take a picture. It was gone when I turned around to pick it up. No where to be seen. 2 hours later with frantic toothcomb searching along the riverbank we gave up. My car keys were in the rucksack with a number of items. Car was locked, window up and house keys in the car! SIL took me home. Neighbours who had a spare key had just gone away on holiday. I remembered that I hadn't locked a balcony door properly so out came a ladder and we were able to get into the house and unlock from the inside and found a spare house key. Now as far as I could remember, my 2nd hand car didn't have a spare key. So SIL was trying to get a spare key from a car dealer but they were closed. DH was away working but called his car retrieval company for me. They refused to come out due to a technicality in our paperwork and where my car was. SIL decided to postpone leaving and leave the next day. While they settled down I looked for the spare postbox key. No spare postbox key but... a spare car "dummy" key! My SILs face was a picture. We drove back to where my car was and the dummy key worked! Some keyfobs have a battery and a signal transmitter that allows the car to start when the key is turned in the ignition. Mine didn't need a signal transmitter to start the car, as proven when turning the dummy key in the ignition. What a relief. DH didn't believe the good news until I sent him a picture!