"Ya, okay, umm these are just a bunch of dull brown moths". Oh, then we must be talking about the Noctuidae, the Owlet Moths. This is the group responsible for such comments. Butterflies and Moths are the second largest group of insects in the world. The largest family in the order are the Noctuids. Some of our worst agricultural pests are in this group, and known as Cutworms. If you work with the family, you'll find out not all of them are plain.
Catocala moths are hard to sneak up on. They have large eardrums on their abdomen of all places. One snap of a twig with your foot, and they're gone. This is why you set out bait for them. After drinking so much liquid, they just fall to the ground and flop around. Either that or they're just plain drunk! This one is Catocala nebulosa, the Clouded Underwing.