Becca and Mike, who are getting married in May, flew in from Phoenix, Arizona, for their engagement portraits. We were blessed with a gorgeous Saturday and thus headed to ever-photogenic Golden Gate Park. Everything was so wonderful—the warmth, the scampering squirrels, the friendly ducks—that we were completely caught off guard when a brain-hungry zombie tried to photobomb our session. Luckily, the gory encounter only served to strengthen Becca and Mike’s commitment to each other. Here’s how the afternoon went down.