This Boat Is Up For Sail
We guess this boat is “Knot for sail.” However, it is definitely “For Sale.” We would say there was an irony there, but none of the two slogans really contradict each other. The boat is wholly motorized, so it definitely cannot sail, and “knot” just means nautical miles. If you are willing not to take the pun literally, yeah, there is some humor that the owners are putting the vessel on the market despite the name. Obviously, the camera guy thought it was funny and grabbed a picture; well done.