Audition tapes are awesome to watch, as we get to revisit footage of Hollywood’s biggest stars and Z-listers showcase their acting chops in hopes of winning the film or TV role of a lifetime. Or at least that’s what they’re dreaming of when entering these casting calls. Though in most cases, these on-screen performers fail to get the part—screwing up huge by going off-script, overacting, or simply freaking out the producers. Ask Chris Klein about that one.

With all the horror stories circulating across the Net, we discovered a number of actor audition fails on YouTube that serve as prime examples of what never to do when called in to do a screen test. Take notes.