This answer has probably changed a lot over the years, from celebrity battles like Shannon Tweed vs Shannon Whirry or Teri Hatcher vs Tammy "Sunny" Sytch to real life counterparts from neighbors to co-workers and other matchups, but the current one is at a local coffee shop.
One of the barista's is 25-26 and just married. She's about 5'1" and a former college soccer player with the best legs/ass I think I've seen on a shorter girl. She's blonde, cute and pretty, and pretty sure of herself. One of the regular customers is similar in looks, with the only butt that might rival the barista and great legs as well. She seems like she's a couple of inches taller, but otherwise very similar. Both are young, blonde, and have unique facial features. Both have small chests (B cup at most). Both seem confident in themselves without seeming arrogant. Also, whenever the customer comes in, I swear the barista spends more time talking to people at the other tables, cleaning up, and otherwise making sure she's close to the table the customer is at. The last time I saw them both, I swear the barista accidentally bumped the other girl a couple of times. I'd love to see the two of them wrestle each other with maybe a bit of sexfighting involved.