Riding home from a pic-nic in the park on a sunny afternoon, baggy shorts and Hawaiian shirt, I watched as a tiny object ahead of me on the right increases in size before nailing me in the chest. Although I felt the impact, it didn't hurt so I just kept going. About a half block later I feel this sharp stinging pain in my chest. I smacked the area with one hand while braking/stopping wiht the other hand. Just as I come to a stop a near-dead wasp falls out from the bottom of my shirt. I figured when he hit me he must of bounced between the buttons of my shirt and get caught inside long enough to recover and sting me.