So let's begin.
Paul Tracy- Tested for Benetton in the mid 90s sometime, but probably not picked up because Schumi didn't want a strong teammate. But Tracy was also known for a lot of silly smashes, such as crashing his teammate out at Detroit during a CART event and then winning the race! Also, in 1995, Sam Posey (F1 Reject) called Paul Tracy accident prone on the first lap of the first race in Miami, and then Tracy proceeded to run the car into the barriers not 15 seconds later. This is not to say PT didn't have a lot of brilliant drives, but the number of smashes probably put the two tallies on equal terms. Paul Tracy would definitely have made it interesting, especially if he and Sebastien Bourdais were on the grid together... oh Paul, where's your Macho Libre mask and Quebec Flag Cape?
![Razz :P](./images/smilies/icon_razz.gif)
Alessandro Zampedri- He caused not one, but TWO pileups before lap 1 of the 1994 Surfers Paradise CART round was over, and one before the green flag! In all his other starts that I remember, his pace was... well, really really slow, but, like Jean-Denis Deletraz, he has apparently rejuvenated his career in touring cars, because I hear he's a Porsche Supercup driver (and double champion!) these days.
David Ragan- A NASCAR driver who is known around my household as "Deer in Headlights". There's a good reason for that. Once he wrecked one of his teammates in a pretty pathetic move at a high-speed oval and on road courses he might as well be an inanimate object!
A.J. Allmendinger- Transitioning from NASCAR to F1 is going to be so steep a curve I don't think A.J. could handle it in all honesty... then again, JPM isn't doing so bad, but he had some starts in the lower-tier series before coming up to the Cup level in NASCAR... A.J. would need some GP2 starts if he's going to make a serious F1 attempt.
Paul Menard- NASCAR's first obvious pay driver (yes, he is the son of John Menard, owner of the old Team Menard CART team and the owner of the Menards stores that always emblazened said cars) is actually not bad on road circuits, but he's just so abysmally slow that there were people with fewer starts than him that are beating him in the points standings. Why do I say he would be a reject? Is it possible it's the machinery holding him back? Maybe not when you're 35th in points and your teammate is in 19th...