Four comics I read this week featured the same classic gag . . .
Sam's Strip (11/3/1961): Walker and Dumas. Reprinted in an excellent collection of Walker and Dumas's 'metacomic' Sam's Strip just released by Fantagraphics.
Yogi Bear #29 (7/1967): Artist unknown.
The Yellow Streak and Friends Annual #1 (1968): Artist Boring. Reprinted in David Boring (2000): Artist Clowes.
Nubbin (5/5/1986). Artists Boltinoff and Burnett. Reprinted in Robin Synder's Revolver Annual #1 (11/1986). Please note the umbrella in the last two comics. Was there really a chance of rain the day shown in Nubbin? I don't see any clouds in the sky. I think the "WOP!" was premeditated. Where would children's comics be without the "injury to the brain" motif?