On Sunday, Oct. 07, I went to the LA County Arboretum to find that Indigo Bunting - all in vain.
While I was at the parking lot, I noticed how a Yellow-rumped Warbler was attacking its own reflection at a car's mirror. I've seen California Towhees doing that numerous times (mostly in their breeding season), but I've never seen such self-destructing aggression from a Warbler.
If interested, here's a link to a few photos:
Valley Village, CA