A fellow was following a truck in heavy
traffic.
Every block or so, when
they were stopped at a stop light, the
driver of the truck would jump
out
of the cab with a big stick and
bang on the side of the cargo bay.
He’d
then jump back into
the cab in time to drive away when the signal
changed.
The first
fellow observed this for several miles, until he could stand
it

no longer. The next time the truck driver jumped out with the stick,

the
first fellow jumped out and ran up to him. “I’m sorry to
bother
you,” he
said, over the din of the banging, “but I am very
curious; could you
tell
me what you are doing?” Without breaking
rhythm, the truck driver
replied,
“Sure, Mac. Ya see, this
here’s a six-ton truck but I’ve got eight
tons of
canaries
aboard, so I’ve gotta keep two ton of them flying all the
time so

I don’t break an axle”.