Dublin Police — yesterday
Threatening to shoot
Edward Farrell, a boat-owner on the Grand Canal, was held to bail to keep the peace to his brother-in-law, Simon Farrell, also a boat-owner on the same canal, and at whom he presented a loaded gun, the same morning at James’s-street harbour, threatening to shoot him for passing across his (Edward’s) boat for the purpose of getting into his own vessel, which was lying alongside.
Freeman’s Journal 23 November 1842
Irish waterways history 
In comparison to this, harbour hoggers have it easy these days ;)