You know you drive a GP when the window falls down w/o you touching the switch.
"Cable driven regulators FTW"

You know you drive a GP when you get a high idle from the cruise cable moving on the strut tower.

And my favorite...

You know you drive a GP when you realize your car sags at WOT and looks like a dog that's dragging it's butt on the ground trying to get that last chip of poop off.