The MacTavish brothers decided that one of their number would go to America, make his fortune, and return to share it with the rest. The youngest, Ian, was chosen for this task. Off he went, worked hard in America, earned himself a fortune over a few years, and wired his brothers that he'd be returning with it. When he returned to Scotland, he got off the boat and looked around for his brothers but could not see anyone who looked familiar. Finally, a group of bearded strangers approached. 'Ho, Ian, are ye not knowing yer own brothers?' asked the first one. Then Ian realized his brothers had grown beards.
'Fer heaven's sake, laddies, what would ye be growin' them beards for, now?' he asked.
'We had to, lad, ye took the razor wi' ye!'