Google releases new Auto Awesomes all the time. Sometimes it makes pictures snow. Sometimes they sparkle. On certain days, pictures even fall in love. These are amusing, but today's new addition is something more. Nothing can turn an average picture into something memorable like a celebrity photobomb. So Google and David Hasselhoff are here to deliver.
Like most other Auto Awesome effects, users get to experience this photobomb solely by taking a photo, backing it up to Google+, and hoping for the best. Many Google+ users have already publically shared their Hasselhoff sightings, some of which you can see here, here, and here.
Most of the appearances I've seen have been semi-natural, but some are just plain spooky.
Source: Google Blog