Just back from a few days on a friend's boat. He has no sailing or motor boat experience but bought himself a 32ft. Princess so asked me to help him bring it down the Thames from Wargrave to Weybridge. He amazed me daily with his absolute lack of practical ability or common sense but there was one incident which had us both collapsed in laughter.
We moored up at Windsor and I put on a centre line to hold the boat in while I then tied off fore and aft. When I was satisfied that the boat was secure I untied the centre line from the bank. Enter the friend who had been "busy" checking his phone and, in an effort to help, picked up the loose centre line and I watched incredulously as he very carefully tied it off to the stern cleat on his boat. Effectively mooring his boat to itself!!!!!
He then stood back, beaming proudly at me with his contribution to safely securing his craft to the bank, and between bouts of hysterical laughter it took me a while to explain to him the stupidity of what he had done.
There were numerous other incidents but it made me wonder, what have your friends done?