Head on over to your local Sonic between 8pm-midnight on Wednesday, June 3rd and you'll walk away with a. I guess I should actually say “drive away” for most people. Personally, I'll be floating away in my zeppelin, which I've named Led. Sure, the maintenance and helium are quite expensive and it's slow as Christmas, but those are small prices to pay for making a grand entrance when I finally get to where I'm going.
Make sure your local store is participating in the Root Beer Float night before showing up. Beware though, their store locator page has a giant, creepy eye on it that is sure to haunt your dreams. (scratch that, it looks like their background changes ever few hours. Count your blessings.)