I think that ParU, Capt. Brian and Joe in particular will enjoy this. (work safe)

A friend of mine grew up in a small town outside of Tulsa, OK. There's a one-lane bridge out in the middle of nowhere (as most things are in Oklahoma) that was in a bit of a valley, so it was approached on both sides by hills. It was a common practice for a long, long time for the local boys--and some girls, I'm sure--to get racing up one side, get airborne, and land on the bridge. Great fun, scary, rite-of-passage kinds of things that Smalltown America is infamous for.
Well, one night, the kids doing the flying car bit thought it'd be even better to turn off their headlights while they tried this feat. The hilltop made for a blind takeoff, but the road was straight--what could possibly be a problem? Well...there was another car, coming the other way on that one-lane bridge. They probably never even knew what hit them.
The local kids don't do this particular trick anymore, on account of killing a couple of their schoolmates that night.

A friend of mine told a bunch of us about how when he and a friend turned 18, they went and rented a Geo Metro for the express purpose of seeing if they could get it airborne. He said they had just enough time to look at each other and go "That wasn't so bad", when they hit the ground again... hard :D

-There's someone in my head, but it's not me.-

Yes, getting all four wheels off the ground is bad. If the drive wheels lose contact, then you are no longer accelerating. Of course I have yet to find a secluded enough stip of straight road to risk finding the point where the truck will no longer accelerate.

Joy is sitting at the next light in your rusty 75 Ford Pickup waiting for the kid that smirked at you from his "I'm so cool" tricked out Celica at the previous light...5 times in a row.

No my wife will not ride with me in the truck, why do you ask?

Sometimes it just happens. Sometimes there's a nearby hilly street that your brother swears a car moving at just the right speed could catch some serious air on, and of course you remind him that we don't live in a Dukes of Hazzard episode and it couldn't be done, and so the issue rests for maybe a dozen years... until, one night, while the two of you are driving home in the dark, he gives you that sidelong glance-- you know the one-- and before you can draw the breath to say "Whatever you're thinking, no!" absolutely floors it up the hill and all you can do is hope that there's no oncoming traffic or kids playing in the street at 2 in the morning as yes, all four of the car's tires do leave the pavement, and you look over at your brother mid-scream and realize that in all those years since the issue first came up the idiot has made absolutely NO plans about the landing!

Soon after, you are quite relieved to have an excuse to move out of state.

(P.S.: More stream-of-consciousness than directly related, but... whoa.)

People who think they can safely drive with their knee remind me of people who think they can sing when they're actually painful to listen to (like on the commercials I keep hearing for the new American Idol TV show).

Get your hands on the wheel, people! It's dangerous out there!!

My sister can drive with her knee. I cannot. I did try a couple of times, but I can't seem to get the same control as she does. I'm putting this up to the fact that she's shorter than I am, so sits closer to the stearing wheel, so must curl her leg up differently and is at a better angle than I could ever achieve.
Really I just tell her it's dangerous, because I can't do it so I don't want her to do it, either. But I can admit this.

What, an example of things that will astound Jenna?

I somehow don't think driving with one's knees (or, in this case, knee) is all that exciting. Nor is any attempt to best it worthy of statements of incredulity.

But maybe that's just me. I'm neither easily amused nor easily excited.