The flat bugs are not likely to be encountered by a casual observer. First, most of them are really small, and second, they are dark brown and look pretty much like a piece of debris. As a family, these bugs are unlikely to be confused with any other group. I've only managed to photograph one species (Neuroctenus) that I happened to find in leaf litter. This insect was about 4 mm long and dark brown, so it was difficult to get a photo that showed anything but a silhouette. The light patches on the wings, along with the body shape, helped with identification to the genus level. I've also seen a much larger species, about 7-8 mm long, which happened to suddenly fall out of grass onto my leg. Before I could get my camera ready, it flew off, a reaction I hadn't quite expected.