No joke!
You can pretty much have a “national day” for anything, it seems, and today just happens to be National Mud Pack Day.
Which, y’know, congratulations to the Mud Pack people for pulling that one off.
Of course, for such an august occasion, we bring you 13 CLAYFACE COVERS. Because MUD PACK!

Norm Breyfogle

Bob Kane pencils and inks. Jerry Robinson additional inks.

Sheldon Moldoff

Marshall Rogers pencils, Terry Austin inks

Mike Allred (Also used for the Batman ’66 #23 print edition.)

Jim Aparo

Moldoff

Bob Smith pencils, Terry Beatty inks

Moldoff

Rogers pencils, Dick Giordano inks

Possibly Lucciano Vecchio

Breyfogle

From Filmation Batman ’77. Not a cover, but so what? It’s National Mud Pack Day and we’re gonna celebrate it however we want!
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MORE
— 13 RIDDLER COVERS: It’s National Punctuation Day! Click here.
— The LEN WEIN Interviews: The Coming of Clayface! Click here.
September 30, 2021
Aw darn, you left out the Wonder Woman covers. Love that story
September 30, 2021
Marshall Rogers’ wraparound cover to Shadow of the Batman No 5 would be a worthy addition here.
September 30, 2021
You are right!
September 30, 2021
Its a dirty business but someone had to dig up a way to celebrate the day appropriately.
September 30, 2021
Happy National Mud Pack Day to everyone!
October 13, 2021
All interesting covers.
Another favorite is WORLD’S FIENST COMICS #140.
Clayface transforming into Superman.