The Three Kings is a TV movie that aired on ABC in 1987.
It stars Jack Warden, Stanley Shaw, and Lou Diamond Phillips as a trio of patients at a mental health facility, who are picked to play the Magi for the Christmas pageant. The staff even provides them with camels. Trouble is, the three are convinced they really are the Magi, and leave the grounds on their camels. This leads to a lot of problems and misunderstandings before they become local heroes.