The funniest time was in the Lamborghini. It belonged to a dentist who didn't really know how to drive it - he would putt around town like it was a Volvo or something, so it would load up and never run right. He complained that it didn't have any pickup. We got the car late one evening and I was driving home on a rural highway, so we decided to see what he meant. I punched it on the open road, and as soon as it had snorted and sneezed out all the crap, it was like the scene in Star Wars where they suddenly go to light speed. We were going so fast that normal highway curves felt like a slalom course. We came around one curve at about 140 or 145 mph. A half mile ahead I saw taillights, but I couldn't figure out how to take the headlights off high beam, and before I could slow down, the guy ahead of me moved way over onto the shoulder and cowered there until we blew past. I can't imagine how quickly we got bigger in his rearview...
The statistical similarity between these three cars is quite interesting -- all three have between 235-255 HP, and all three had a factory sticker price between $35K - $45K. Although the 928 sold for $40K when that was a lot of money.
In the "not really a car - not really driving" category, I've "driven" the dragsters at the Malibu Speedzone (see www.speedzone.com). This would not be considered driving by most standards -- you control the acceleration, but have no control over braking (it's automatic) or steering (the car is "attached" to a rail). Still, you do have an accelerator pedal and a two-speed semi-automatic transmission (press a button to upshift), and these "cars" do 0-70 mph in just a tad over 3 seconds, which is faster than even a McLaren F1 road car.