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Sit down, Samson, you’re about to get a haircut.
— E. K. Hornbeck · Inherit the Wind

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Calling someone 'Samson' gives the warning a grand flourish, only to cut it down with the prospect of a haircut. 'Sit down' is the plain command underneath the joke. The speaker makes the threat sound almost like an ordinary appointment.
Context reviewed