Joaquin Phoenix’s meltdown/prank on David Letterman Wednesday was certainly eye-opening, but it wasn’t exactly original. There’s a long and storied history of celebrities appearing on Letterman and completely losing their shit. This precedent may lend credibility to the argument that Phoenix’s performance was nothing but an elaborate hoax, perpetrated more for Casey Affleck’s documentary than for the television audience. But this isn’t necessarily always the case. While some of the freak-outs on this list where planned, many of them were genuine meltdowns.

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