From across the road, a man jerking his leg about against a metal post looks exactly like a man getting a shock. The passer-by broke the contact the quickest way he could.
A man is leaning on a lamppost, shaking his foot to get a stone out of his shoe. A passer-by runs over and breaks his arm. Why?
Give me a hintThe hint
The passer-by was trying to help.
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He thought the man was being electrocuted
Source: Jed’s list of situation puzzles, No. 1.65, credited to Rex Boggs