The old man on the moped

An elderly man on a Moped, looking about 100 years old, pulled up next to a doctor at a street light. The old man looked over at the sleek shiny car and asked, 'What kind of car ya got there, sonny ?'
The doctor replied, 'A Ferrari GTO. It cost half a million dollars!'

'That's a lot of money,' said the old man. 'Why does it cost so much?'

'Because this car can do up to 320 miles an hour!' said the doctor proudly.

The Moped driver asked, 'Mind if I take a look inside?'

'No problem,' replied the doctor. So the old man leaned over, poked his head in the window and looked around. Then, sitting back on his Moped, the old man said, 'That's a pretty nice car, all right... but I'll stick with my Moped!'
Just then the light changed, so the doctor decided to show the old man just what his car could do. He floored it, and within 30 seconds the speedometer read 160 mph. Suddenly, he noticed a dot in his rear view mirror. It seemed to be getting closer!
He slowed down to see what it could be and suddenly WHOOOOSSSHHH!  Something whipped by him going much faster!  'What on earth could be going faster than my Ferrari?' the doctor asked himself.  He pressed harder on the accelerator and took the Ferrari up to 250 mph.  Then, up ahead of him, he saw that it's the old man on the Moped!

Amazed that the Moped could pass his Ferrari, He gave it more gas and passed the Moped at 275 mph. He was feeling pretty good until he looked in his mirror and saw the old man gaining on him AGAIN !

Astounded by the speed of this old guy, he floored the gas pedal and took the Ferrari all the way up to 320 mph.  Not ten seconds later, he saw the Moped bearing down on him again! The Ferrari was flat out, and there was nothing he could do!

Suddenly, the Moped plowed into the back of his Ferrari, demolishing the rear end.

The doctor stopped and jumped out and unbelievably the old man was still alive.

He ran up to the banged-up old guy and said, 'I'm a doctor.... Is there anything I can do for you?'

The old man whispered, "Unhook my suspenders from your side view mirror".