(click pics, via reddit)
Not one of the redditors knows (though a couple guessed something to do with Burning Man). The big baby was shot by four different people in the San Francisco/Sausalito area over the last few months. He/She/It has a very tan head. Guess/make obvious Honey I Blew Up The Kid jokes in the comments.
Previously in WTF Is This?: The Melonator • Russian soldiers with guitars playing soccer • Frenchman fucking a huge fly (nsfw) • and the Rolling Grass Thing.