Identification

An Englishman, an Irishman and a Scotsman were out fishing in a boat on a lake together and doing very well. This is a terrific spot for fishing,' said The Englishman. 'How will we know where this spot is next time?'
'I've thought of that,' said The Scotsman, 'I've just put a mark on The side of The boat.'
'You fool,' said The Irishman, 'how do you know we will get this boat The next time?'