Does nothing on an automatic until your speed drops below an appropriate threshold.
In every automatic transmission car I've driven, you can pull it down a gear. I hated racing in stock automatics, but I could bleed speed off fast by pulling down a gear.
But hey, lets say you have a transmission that you can't shift between gears.. You can shift to neutral. Your car has neutral, doesn't it?
Turn off the key
Many new cars (Priuses, for example) don't have mechanical keys, ...
Luckily, the car in question was a Mercedes, not a Prius.
Spin the car.
At 80MPH, "spinning" the car means flipping the car, and will likely get you just as killed as the "brick wall" method of decelerating.
Depends on the car and conditions. I wouldn't recommend attempting it in a jacked up 4wd truck. Unfortunately, I've seen plenty of cars do it. Sometimes on the track. Sometimes on the street. I've never witnessed one flip without some assistance. That's usually sliding into something that will upset the driving a bit more, like a curb, going off road into sand, etc. The whole thing with cars flipping as soon as they start spinning is Hollywood. Spinning cars don't make the news, unless they *do* flip. They rarely even result in a traffic ticket.
Even hard maneuvering will bleed speed off.
This one really will always work, but as with spinning, careful just how hard you maneuver at high speeds.
Really, everyone should learn how to drive. Like, performance driving on closed tracks. You'll find out that both you and your vehicle are capable of far more than you think. A 80mph slalom is perfectly possible in most vehicles. Heck, I ran a tight slalom course in a minivan without hitting any cones. It bled off a lot of speed, since it didn't have the power to hold its speed.
Oddly enough, I did have a possibly catastrophic incident in that same minivan. The air cleaner lid came loose, and fell under the accelerator linkage at full throttle (coming off a light). I popped the shifter to neutral, turned the key off, let the engine stop, then unlocked the steering wheel so I could coast to the side of the road.
I'm a serious believer that everyone should receive good training in how to operate the tons of death that they sling around daily. It would probably save an awful lot of lives, including the subject of the link. It's unfortunate that most states only require a cursory knowledge of what the controls in the vehicle do, and what traffic control devices mean. Knowing how to parallel park is nice. I'd rather that people were taught how to recover from potentially fatal situations. Most people don't know what their brakes can do until the first time they have an emergency. That is, if they aren't distracted talking on the phone and eating a big mac while driving.