Actors who work on film or television sets together often become good friends, which has lead to an impressive number of stars who got tattoos together. Film sets can serve as bonding experiences for actors, as big-budget productions involve countless long, grueling hours. Additionally, when a TV show manages to stay on the air for multiple seasons, a lot of the actors wind up spending years with their “television family,” and tattoos are a great way for them to commemorate the end of a popular series.
Viggo Mortenson and Elijah Wood are great examples of celebrities with the same tattoos; the duo went along with seven other cast members from The Fellowship of the Ring to get matching tattoos of the Elvish word for "nine." The casts of Suicide Squad and Mad Max: Fury Road also decided to get matching tattoos, and the former even skipped the tattoo parlor to do the actual inking themselves. Whatever the actors' reasoning is, you can be sure that movie and TV casts with matching tattoos are having a good time.