George found me this little moth, in the house. I took a few pictures (poorly lit) then popped it into a container in the fridge overnight for some better-lit pictures. Weirdly, it seemed perfectly lively even while in the fridge - not the slightest bit slowed by cool temperatures. I chased it around the garden for a while after releasing it, before it settled somewhere I could take pictures.

I think it's Triangle-backed Eucosma (Eucosma dorsisignatana). Somerville MA, 9/18/2014.