A fired bookkeeper (Harold Lloyd) gets drunk, gambles and buys a circus.
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Movie theaters showing The Sin of Harold Diddlebock near Morristown,NJ:
| Harold Lloyd | Harold Diddlebock |
| Frances Ramsden | Frances Otis |
| Jimmy Conlin | Wormy |
| Raymond Walburn | E.J. Waggleberry |
| Edgar Kennedy | Jake |