You could with Pepsi's Billion Dollar Sweepstakes! Here's how it works:
You buy an assload of Pepsi and enter your codes online. Your twenty or so entries will be against only 100 million or so from around the rest of the US. And a whole 200 of these entries will be selected to go to LA for the next round!
Now, once you've made it to "The Event", you're up against 200 people. All you have to do is pick a random 6-digit number and get it right! It's a one-in-a-million chance, assuming that you've made it this far to begin with!
Now that you've won your billion dollars, here are your options:
Option A) Take 250 million of it right now, and go home.
Option B) Take your billion dollars in this method of payout:
Years 1-20: You get $5 million per year.
Years 21-39: You get $10 million per year.
Year 40: You get $710 million.
You win a billion dollars, and you only have to wait 40 years to get it all!