A gnome, an elf and a dwarf were out fishing in a boat on a lake together and doing very well.
'This is a terrific spot for fishing,' said the elf. 'How will we know where this spot is next time?
''I've thought of that,' said the dwarf, 'I've just put a mark on the side of the boat.'
'You idiot,' said the gnome, 'how do you know we will get this boat the next time?'