Wait ... Alternate Caption
Nope ... I didn't see this happen. I imagine though this might be the result of using alcohol for bait or something. What you don't see here is a slight incline before the light as Thorndike Ave emerges from under an overpass. I assume he neglected to hook the bow to the trailer. He was probably stopped at the light and the boat just slipped off the trailer into the street as the light turned green.