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If by worst, you actually mean worst, and not 'groan worthy brilliance'...
Years ago, I was helping Gramps build a new chicken coup. After he cut a length of wood, he laid the saw on top and said, 'Now we let rest for a while', I asked why, and he pointed at the saw and replied 'Still saw'.
If you mean Groan worthy brilliance... I like Gary Delaney's : I recently took my naval exams. I got seven Cs.