If you have small children hooked on the TV show Yo Gabba Gabba! you'll recognize this crocheted beanie hat right away. I don't know why Yo Gabba Gabba! is so popular with kids - the show is non-sensical, but with a very catchy tune.
It's the Plex robot beanie hat, by Etsy seller UrbanPrincess: Link - via Yokiddo