These Celebs Shared Their Favorite Childhood Costumes With Us — Including Photos

Harvey Guillén has long been a fan favorite for his role of Guillermo on "What We Do in the Shadows." Most recently, he appeared in "Blue Beetle." As someone who takes on different roles for work, Guillén shared his favorite Halloween transformation, which took place in 2012.

"I grew up in Southern California, so Bob's Big Boy was a staple," he tells POPSUGAR. "It was a treat to get pancakes on Saturday morning there, and I would always stop at the statue up front and make this pose. And as an adult, I said, 'Why not be him for Halloween?' It brought so many memories back with family . . . and now I want that cheeseburger! Ha!"