Old Jock the Amazing Scotsman

A man came to a small town where a circus was in process. A sign read: "Don't miss Jock The Amazing Scotsman." The man bought a ticket and went in. There, on centre stage, was a table with three walnuts on it. Standing next to it was an old Scotsman. Suddenly the old man lifted his kilt, whipped out his huge member and smashed all three walnuts with three mighty swings! Old Jock was carried off on the shoulders of the crowd to a roar of applause.
Ten years later the salesman visited the same little town and saw a faded sign for the same circus and the same sign "Don't Miss Jock The Amazing Scotsman". He couldn't believe old Jock was still alive and doing his act! He bought a ticket. This time instead of walnuts, three coconuts were placed on the table. The Scotsman came forward suddenly lifted his kilt and smashed the coconuts with three swings of his amazing member. The crowd roared with applause!
Flabbergasted, the salesman asked to meet him after the show. "You're incredible!" he told the Scotsman. "But tell me - you're older now, why switch from walnuts to coconuts?"
Well," said old Jock, "Me eyes are nae whit they used to be!"