It's Bay to Breakers this Sunday. Heck, you might already be pre-gaming for the "race." For those of you actually running it, we wish you good luck. For the others donning costumes and taking sips from an undisclosed bottle hidden somewhere on your body, we've got an instagram contest for you.

We want to see what insane costume you've cooked up for the big day, no matter how weird. Gram a pic on your phone and use the tag #7x7B2B (please no naked body parts), and we'll choose a winner this Monday, May 21st! And what will the winner get? He or she will receive a pair of tickets to our annual Best Of bash at Ghirardelli Square on June 7, as well as a gorgeous coffee table book from our pals at Chronicle Books.

Now, get gramming!