One-Shot "Something white"

Panel 1.
The panel shows a 10 year old white boy and a black-skinned man.
Boy (to the man): There’s something white on your back…
Man (to the boy): Get lost.
Panel 2.
Boy (to the man): There’s something white on your back…
Man (to the boy): I said, get lost!
Panel 3.
Boy (to the man): There’s something white on your back…
Man (to the boy): Yeah-yeah, happy April Fools’ day, and all that! Now, scram!
Panel 4.
Boy (to the man): There’s something white on your--
The black man turns to the boy in anger, and we see that the black-skinned man’s back is white-skinned.
Man (to the boy): You dumb, or something!? PISS OFF!