When you've acted in a film franchise for many years, it's natural that one would get very close to their castmates. It’s a bonding experience that very few people can relate to and, often, the people you share it with become your closest friends. That was true for the cast of the Harry Potter series who essentially grew up together on the set, due to starting work on 2001's Sorcerer's Stone as tweens. They even almost got tattoos to commemorate their experience. However, Daniel Radcliffe couldn’t commit to getting inked alongside Rupert Grint and Emma Watson, and he had a good (and funny) reason why.
