Outlandish SF technologies we'd like to have

Let's define "outlandish" as "with no theoretical basis in fact or even speculation." This gives us tons of technologies in Science Fiction, from phasers to warp drive to immortality, but excludes such things as Dyson Spheres and even some forms of FTL travel.

I'll begin with one which could have serious, useful applications right now: the stasis field as proposed by Larry Niven.

He describes it something as "disconnected from the entropy gradient of the universe." It conforms, or can conform, to any shape it covers, and it's 100% reflective to any and all types of radiation. The gist of it is that time doesn't pass inside a stasis field. In his fiction he uses it mainly as a safety system to protect ships and passengers, instead of suspended animation on long interstellar trips, and to preserve important items for a long time. But also for more mundane tasks such as keeping food warm.

The catch is if you're inside a stasis field you cannot turn it off (no time!). So you need something outside it to do so. The other method is to place the stasis field inside another stasis field, which collapses both fields. Since they appear without big power sources attached in Niven's stories, I surmise they use up very little energy.

Here's one application for it in our time, besides those Niven already used: the ultimate densification of air travel. Simply place passengers in stasis, in boxes, and load them like cargo on the plane. You could easily carry as many passengers as the plane can safely lift. You'd do away with cabin crew, seats, galleys, lavs, etc (no cabin required any more!), and just require two pilots. On long haul flights with three or four pilots, though, you'd still need a crew rest area, unless you wanted to bring along fresh, rested crew on stasis.

Best thing is that if the plane crashes, everyone survives unharmed. Even the pilots need only activate the cockpit stasis field before impact. You may even set up designated crash zones near airports, or along busy flight routes, and direct troubled planes to ditch the plane there. If one are convenient, aim the plane to the nearest empty area and crash.

There are other advantages. if your flight is delayed on the tarmac for hours, you won't know about it. And there are disadvantages, as you'd also be unable to let anyone else know you'll be late, or pressure the crew to let you off to catch a different flight.

The food industry would be revolutionized, too. You could buy hot meals in stasis today, and they'd still be hot eons from now. You wouldn't need refrigerators to preserve food, or even to keep it cold. Buy an ice cold stasis beer or soda can, and it will still be ice cold when you open it. No more preservatives, either. No more picking fruit before it's ripe and hope it ripens en-route to market. Pick it ripe and place it in stasis.

And so on.

EMT services would change, too. instead of stabilizing an injured patient, just put them in stasis and get them to a hospital. you wouldn't even need to rush to the hospital.