Lay out text so that individual letters are randomly shifted up or down from the baseline. The motivation is to make it hard to OCR because one cannot easily determine what line a character belongs to. Kind of a tricky puzzle assuming lines should be closely spaced.
Spacing between letters can be altered; letters squashed or stretched; letters mashed into to neighboring ones into a single connected component.
Design an alphabet to make things even tougher.
Inspired by Lavabit handing over its cryptographic keys in 4 point font, successfully making it too difficult to OCR.
Apply all-or-nothing cryptography forcing the reader to transcribe the text perfectly. This I think is fairly easy.
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