Last May, Fernando Alonso skipped the Monaco Grand Prix to run the Indy 500 in a joint effort with McLaren and Andretti Autosport. Alonso had never raced or even driven on an oval before, and his debut took place on the biggest stage in all of motorsports.
And he did damn well, starting fifth and running up front until a late engine failure took him out of the race.
On a random cruise through YouTube, I found this video of Alonso's entire race from his on-board camera. Please, enjoy: