Poor Tin Man

Ebsen was originally cast as the "Tin Man" in the 1939 classic The Wizard of Oz. He recorded all his songs, went through all the rehearsals, and started filming with the rest of the cast. He was rushed to the hospital nine days after filming began, when his lungs seized after a week of inhaling aluminum dust from the dangerously experimental "tin" makeup.

While Ebsen was in the hospital for two weeks, recovering from a near-fatal allergic reaction to the dust, he was replaced by Jack Haley. Haley didn't run the same risk, as the makeup was changed in the meantime from a dust to a paste... MGM did not publicize the reasons for Ebsen leaving the film, and even Haley wasn't made aware of why Ebsen left until later; in an interview videotaped before his death, Ebsen recalled that the studio heads didn't believe he was sick until someone tried to order Ebsen back to the set and was intercepted by an angry nurse. No footage of Ebsen as the Tin Man has to date surfaced. - From Wikipedia "Buddy Ebsen"

P.S. - "I'm telling you, Dark Side of the Moon totally synchs up with the Wizard of Oz!"