During the musical number "Work This Out," Troy's suddenly disappears before returning again. Troy's red and white shirt appears in all three "High School Musical" movies. There's a reason Troy's ...

Efron, who portrayed basketball and singing star Troy Bolton in the beloved "High School Musical" series, shared a photo of himself making a return visit to the set of the movies on Instagram Friday.

This shirt actually went on to make an appearance in both "High School Musical" sequels. He can be spotted wearing it during "You Are the Music in Me" in the second movie and again in his bedroom ...