We had a nutter accuse us of leaving every gate open (we didn't) speeding (we didn't) and being the main thing that's wrong with the waterways (obviously we're not) on a lock flight earlier this year, deliberately jumped on the side of friends boat to make it rock as hard as he could and raged in my face from about 4 inches away whilst menacing me with a trowel in his hand held in a dagger grip just above my neck, gonna sink our boat and various other threats. Didn't do him any good, I tend to react to people the same way they treat me, up to and including violence, spent half my life facing down thugs, after a few minutes where I'd reduced the final 4" gap between our faces to zero I could see the guy was thinking "shit, intimidation failed, what have I done, how do I de-escalate this". I'm laughing about it now just remembering the look on his face, should have got a photo!