Ali G: Who Iz I? stooge says he was in on joke but didn’t tell Sacha Baron Cohen: ‘He’s not going to punk me. I’ll trick him’

Exclusive: Joshua Loudermilk says suspicions first raised during filming by gun shaped like wearable plastic bottom: ‘You’re gonna put a butt on top of a butt? You can’t run in that’ • This article contains spoilers for Ali G: Who Iz I?