The 1985 Indianapolis 500. Danny Sullivan dueling with Mario Andretti for the last dozen or so laps. Andretti's car clearly outmatched, but blocking Sullivan with a masterful display of driving. Sullivan finally went down onto the apron to pass, spun in front of Andretti at over 180 mph, recovered, and tried the move again on the last (second-to-last?) lap to get the win.

Two hours of dull round-and-round leading up to it, but without a doubt the most exciting finish I've ever seen.