Half Marathon Crazy Bumper Stickers Posted on 2012/09/03 by admin Runners, joggers and anyone attempting to complete a half marathon. 13.1 because 13.2 would be crazy! Check out this funny custom design on tees, shirts, mugs, pajamas, gifts and other apparel. product tags: funny, humorous, run, race, running, runner, marathon, walk, athlete, crazy, fun, sport, track, miles, most, popular, bumper stickers,