Leonardtown Crash from Bryan Vaughan on Vimeo. If you’ve ever seen those cartoons where someone tosses thumbtacks on the road and a car or bicycle runs over them and gets flat tires, it seems both funny and harmless. But that wasn’t the case at a local bicycle race over the weekend. The Post’s The Crime Scene blog has a story of a race in Leonardtown, Maryland on Sunday during which tacks were thrown on the…