It bit him in the night, he swatted it when it landed on the ceiling, and the blood was his own.
Most people go straight to a crime.
A man wakes up and finds blood on his bedroom ceiling. How did it get there?
Give me a hintThe hint
Whose blood is it, and how much is there?
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He swatted a mosquito on it
Source: Mark Isaak, in Jed Hartman’s list of situation puzzles, no. 1.19