It showed up in our backyard while we were away for a week. We had a house/dog sitter here but she says it's not hers. There were a bunch of painters here the whole week and we figured it was theirs, but they left it here, too. I tried a google image search but got nothing. It doesn't have any labels or other identifying stuff.
Attachment 388175
Also an excuse to post this:
https://www.youtube.com/watch?v=DU_Gd623HJo