"We actually went to school with him. He was held back a couple of years, but we were in the same grade," Wolfhard explained. Together, they sold out high school proms, bar

"We actually went to school with him. He was held back a couple of years, but we were in the same grade," Wolfhard explained. Together, they sold out high school proms, bar mitzvahs, birthday parties and nursing homes.

However, as they gained momentum, a guest at a wedding was a Netflix executive who asked them to audition for a new show. According to the boys, they were hesitant to go because they were "really committed to the band." Yet, at Corden's encouragement, they all went—and all but one got the part. We think you know which one...