The tractor will wait til your car sleeps, rests, or feeds.
Then it will slowly & stealthily creep towards it, pouncing
at the breakneck speed of 2 mph. The tractor will then
have its way with the car, depositing a small bolt within
the car. The bolt will feed on the car, growing until it
bursts forth from the body as a larva. Gender is determined
by the temperature of the car...Those parked in the shade
will mature into a jenny....those parked in the sun will be a
Jack.
The host car dies, but life goes on as the larva becomes a
juvenile, & then matures into a fully grown tractor.
Isn't biology fascinating.
Wasn't sure about funny or optimistic. Funny won in the end.