My fathers mate had an aluminium speedboat on Loch Lomond at Luss, one night 4 of them went across to the Inversnaid Hotel and got completely bladdered, then thrown into the boat by the bartender at chucking out time and they gave it full throttle back to Luss. Next morning one of the kids on the caravan site knocked on the caravan door shouting "Uncle Alex, your boat has sunk" to which Alex in a rather hung over manner shouted back, "It's not a boat, it's a f**king submarine"