Moped vs Ferrari

An elderly man on a Moped, pulls up next to a doctor at traffic
lights. The old man looks over at the sleek shiny car and asks, "What
kind of car you got there sonny?" The doctor replies, "A Ferrari GTO,
it can do up to 320 miles an hour," he said proudly. "Mind if I take a
look inside?" "No problem," replies the doctor. So the old man pokes
his head in the window and looks around. Sitting back on his Moped,
the old man says, "Nice car, but I'll stick with my Moped!" Just then
the light changes and doctor floors it to 160mph. Suddenly, he notices
a dot in his rear view mirror getting closer. He slows down and
suddenly WHOOOOSSSHHH something flies past him. He speeds up to see
what it is and up ahead of him, he sees the old man. Amazed that the
Moped could pass his Ferrari, he gives it more gas and passes the
Moped at 275mph. He's feeling pretty good until he looks in his mirror
and sees the old man gaining on him. He takes the Ferrari all the way
up to 320mph. Again, he sees the Moped bearing down on him. The
Ferrari is flat out, and there's nothing he and do! Suddenly, the
Moped ploughs into the back of his Ferrari. Unbelievably the old man
is still alive. He runs up to the banged-up old guy and says, "I'm a
doctor.... is there anything I can do for you?" The old man whispers,
"Unhook my braces from your side view mirror!"