Let’s see…
I’ve never used rollerblades (I’ve got a bad knee that won’t allow this kind of sport), had a CT scan, and up until this year, possessed a cell phone or a PDA. However, now that I’ve got both, I consider them indispensible. 
Robin
I never used the Internet. What is like?
too funny!!!
What the fuck is a Sybian? It’s the same as a thespian?
Checking against what others have listed:
•rollerblades, motorcycle, inline skates, ice skates, or razor scooter
•CT scan, pacemaker
•machine gun (darn, now you made me want to, Monster!)
•headset phone, pager
•portable internet device (I’ve got Palm Envy… mine’s only a III)
•PS2, Game Boy, mp3 player, or Napster
•Videoconferencing, PC video camera
•recompression chamber (2nd you on that, Orca!)
•One of those newfangled little open-air, rotate-the-pizza cookers (I don’t even know what that is!)
•vibrator (don’t even want to think about using one!)
•any of the exercise machines mentioned so far
•tractor
•humidifier
I’ve used everything else mentioned, but that’s still a long list so far.
Remember the mechanical horses out in front of the grocery store that you could ride for a quarter when you were a little kid?
The Sybian is similar. Except they don’t rock back and forth. And they are rarely found in front of grocery stores. And the pommel is a wee bit more pronounced.
Ah.Rarely found. When they were found, to begin with?
I’ve never used an MP3 player, an electric toothbrush, or a portable CD player. My 20-yr-old son thinks I’m a dinosaur.
I’ve never used the “Anal Power-Fister 4000” by Ronco, though the TV ads make it look interesting.
Once upon a time, Uniball, the Sybian was found in front of certain restaurants. Usually those all-you-can-eat buffets, with the real nice spread.
Oh yeah, the OP. I’ve never used a cell phone.
I tried to host an “all you could eat buffet, with a real nice spread,” but no one, uhhhh, came. So I’m thinking about maybe getting that Sybian as a Xmas present to myself.
an electric type writer.
electric can opener.
electric carving knife.
I tried to use a mechanical pencil and I kept breaking it so I did try to use one of those.
garage door opener.
I avoid doorbells (they make me suspicious), I just knock.
probably a whole lot of stuff I haven’t even heard of.
I think they’re new, since I’ve seen them in stores and advertisements only for a couple of months now.
The best way to describe one is it looks a bit like a Cuisinart without the stirring attachments and with a powered Lazy Susan for the pizza. The heating element looms a couple of inches above the pizza. The pizza revolves on the turntable and passes under the heating element which is big enough to cover only one slice of the pie. Eventually the whole pie catches enough heat to be cooked through and through.
And that’s what seems confusing.
The results look appetizing enough, but it strikes me as a very inefficient way of cooking a large piece of food. While one-sixth of the pie is taking in heat, the other five-sixths are radiating their heat back out into the room.
I’d try one out but they cost around $80 (too much for tackling one specific food) and I’ve presently got precious little counter space in my house.
If any Dopers do get one, or have tried one, please let me know how well they work.
/Homer Simpson voice/They have the Internet on computers now.
A pager, and I never will. I hate the alarm clock in the morning; why would I want to carry one around in my pocket?