Best fail I saw was again in Cardiff....
It was a busy lock and large cruiser was trying to lock in. The crew were a larger, older couple.... all going well but coming in way too fast. So he slams boat into reverse, whist standing in the door to the cabin so he now starts going backwards.
Somehow, he managed to inflate his life jacket, which then wedged him in the door unable to move.... he’s now barking instructions to his wife who was trying to push him through the door.
So he is now going backwards slowly towards lock gates that are starting to close..... he moves through the gap out into the outer harbour. Most of the boats are weak with laugher at this.
He is then on radio to lock control asking to come back in, they are very definite saying no and advising him not to reverse out of a lock he wanted to be in. He then wanted someone to help deflate his life jacket so that he can move about his boat again....
Moral of the story.... be careful using your life jacket.... and learn how to control the speed of your boat 😉