Here's one of my own. Years ago when the children were young, I was driving from Essex to Wales on a Bank Holiday. My eldest son suddenly asked from the back if it was normal that the battery, which was under his seat, was hot and smelly. We stopped and eventually a breakdown truck came out and towed us to a garage. I rang my friend and anxiously told her that we were going to be very late as the altimeter had broken. There was a smothered snigger and then sympathy from the other end of the phone!