When you can pop the trim panel, and flip the switch for the "Check Engine" light, and put the trim panel back on at 65 MPH in the dark, without drifting in your lane.
When you carry a 12mm box-end in the glove box for the sole purpose of tightening the stupid nut on the windshield wiper, when it's snowing hard.
When you publish 15 page documents showing how to get down to replace the timing chain tensioners on a GV 2.5 V6.
When you know the torque values for the oil drain plug, and the lug nuts in Newton-Meters, by heart.
When you think of all motor oil as either 5W30 (good)or "something that'll trash the timing chain tensioners in a GV 2.5 V6"
When you wonder where Superman got his Suzuki flight suit.