The Chronicles of Sheldon Mayer's Sugar & Spike
Sugar & Spike #6 
Reprints: None [yet]
Spike's dad comes home to find the kids sitting in the corner, apparently for finger-painting. He can't understand that, until he finds out what they were painting with, and the feline invasion that resulted.
A very cute example of the singe page stories that Mayer excelled in. The cats in this one are especially adorable.
A few issues later in the letter column there was a note from a reader who didn't quite understand the punchline to this story. Oddly I read the issue with the letter long before I read this issue, so I was wondering what the letter-writer meant. It's unfortunate that the upcoming reprint probably won't include letter columns, as they're a delight.
Characters: Sugar, Spike, Mr. Wilson, Mrs. Wilson, dozens of cats
Damage: The walls can be cleaned, I guess. That furniture might never be the same
Punishment: In the corner, twice
"I wish they'd make up their minds!"