The contenders:
Eau Rouge - Spa/Francorchamps, Belgium
The Corkscrew - Laguna Seca, Monterey, CA
The Karussell- Nurburgring Nordschleife, Nurburg Germany
The Masta Kink - Old Spa Course, Belguim (infamous for killing drivers and spectators in crashes over the years, and the reason Jackie Stewart revolutionized F1 safety in the '60's)
Turn 4 - Darlington Superspeedway, Darlington, SC
Flugplatz - Nurburgring Nordschleife, Nurburg Germany
The Hairpin - Monaco, Monte Carlo
Anyone else have suggestions?
Esses - Circuit De Le Sarthe, Le Mans, France (thanks Matt!)
130R - Suzuka, Japan (thanks Pat!)
...and the obvious one I forgot to post:
Parabolica - Monza, Italy