The mistakes. • Mistake #1: never be in a hurry. • Mistake #2: always keep the burlap grocery bags in the car. • Mistake #3: don't interact with the 17" screen while backing out of the garage. • Mistake #4: don't be distracted by something in the side of the garage (not near the car) while committing mistake #3 • Mistake #5: don't drive into a closed garage door. The play-by-play. I was running out to the grocery store. I went out to garage, opened garage door, went to car, got in. Realized the burlap bag I use for groceries was inside in a kitchen cupboard, so ran back in to get it. Then ran back out to car. Was thinking about TuneIn and whether I should try it again or just stick with talk AM radio on the drive. Looked out rearview mirror (bright daylight, all is clear in driveway), side mirrors (all's clear), put car in reverse. Still thinking about radio vs TuneIn. Looking out driver's side mirror as I reach for the musical note app icon on 17" screen. Didn't actually look at screen while I reached and tapped screen. Redirected gaze to right left mirror (two car garage, car has to be parked real close to right edge of garage door frame on ingress and egress), continuing to back out, at around 1-2mph. It occurs to me the garage has gotten awful dark. It hasn't yet, in the ensuing milliseconds, occurred to me what that means. Milliseconds fly by. Suddenly KERRRRRRRRUNNNNNNNCCCCCHHHH. I stop. Instantly. Now it occurs to me why it suddenly got awful dark. The garage door was CLOSING! What the? How the? I backed into it.I couldn't understand why. The rear of my Model S just hit one of the aluminum support bars that are spaced every 16 inches or so in the garage door. I immediately roll forward. Garage door reverses itself (it had not fully closed) and goes back into the up position. Full daylight fills the garage once again. I get out, cursing, and check the damage. Very minor dent right under the rear spoiler area, to the right of and near the T logo. Plus, on closer inspection, to left of dent, about 4 inches of a horizontal hairline's worth of paint removed. Crap. The conclusion. The only thing I can think of is I inadvertently tapped the garage door open menu item in the Homelink menu, which by default drops down when I'm home, thanks to geolocation. My Homelink menu has two menu items, one for the garage, and one for the gate at end of driveway. So it eats up a little bit of screen real estate on top of 17" screen when deployed. My intent was to tap the music/multimedia icon, but I tapped the garage. Since my windows were closed, I didn't hear the garage door kick in. When I put it into reverse, I didn't know the garage door had begun its journey towards closing. If I had been going more than the routine 1-2 mph, I might have punched right through the custom wood-lined door. Today's been a bummer of a day.