Advertisement First time I saw one of those in person was sitting outside at night drinking beer with a group of friends. A big adult male flew up to an outdoor light. Everyone stared "What the hell is that thing?!!" And me mister smarty pants said "That's a male dobson fly. They are harmless. blah blah." Just as the damn thing flew over and landed on my nose! I'm a macho dude but, I screamed like girl.