"The Fastest Car:" joke

A man goes out and buys the best car available in
the US or Europe, a 2001 Turbo BeepBeep. It is the
best and most expensive car in the world, and it
runs him $500,000. He takes it out for a spin and,
while doing so, stops for a red light.
An old man on a moped, both looking about 90 years
old, pulls up next to him.
The old man looks over the sleek, shiny surface
of the car and asks "What kind of car ya got
there, sonny?".
The dude replies "A 2001 Turbo BeepBeep. They cost
$500,000."
"That's a lotta money!" says the old man, shocked.
"Why does it cost so much?"
"Cause this car can do up to 320 miles an hour!"
states the cool dude proudly.
The old man asks "Can I take a look inside?"
"Sure" replies the owner.
So the old man pokes his head in the window and looks
around. Leaning back on his moped, the old man says
"That's a pretty nice car, alright!"
Just then the light changes, so the guy decides to
show the old man what his car can do. He floors it,
and within 30 seconds the speedometer reads 320.
Suddenly, the guy notices a dot in his rear view
mirror. It seems to be getting closer!
Whhhoooooooooossssshhhhhh! Something whips by him,
going maybe three times as fast! The guy wonders
"What on earth could be going faster than my Turbo
BeepBeeP?" Then, ahead of him, he sees a dot coming
toward him.
Whooooooooooosh! Goes by again! And, it almost
looked like the old man on the moped! It couldn't be
thinks the guy. How could a moped outrun a Turbo
BeepBeep?
Again, he sees a dot in his rearview mirror!
WhoooooooshhhhhhhhKa-BbbbblaMMMMM! It plows into
the back of his car, demolishing the rear end.
The guy jumps out and discovers it is the old man!
Of course, the moped and the old man are hurting
for certain. The guy runs up to the old man
and asks "You're hurt bad! Is there anything I can
do for you?"
The old man replies "Yeah. Unhook my suspenders
from the side-view mirror on your car!"