Never gone to one, love to go to one. Simply, it's a faster version of NASCAR (
Non-
Activity
Sport
Centered
Around
Rednecks
) with open-wheel race cars.
Ya get to listen to Gomer Pyle (Jim Nabors) singing the traditional Indiana state song "Back Home Again in Indiana" before the call to "Gentlemen (and lad(ies), if any female race drivers qualify), start your engines!"
Highly recommend getting some ear plugs... the roar of those race cars hauling ass at 200+ mph will make you go deaf!
Official website:
http://www.indy500.com/
ETA: Sarah Fisher qualified this year in Row 7, so it is "Lady and gentlemen... start your engines!"