(Strip Number 4038, Original Publication Date, 24 July 1981)
Panel 1: Going from left to right, we see the following things:
1) A filthy Mike standing very close to the wall of the cabin where he learned to love clapped-out old barns and smiling as he looks over his shoulder without being seen.
2) Elly trying to prize a freaked-out Lizzie from a birch sapling and get her into the outhouse.
3) Elly yelling "ALL RIGHT!!! WHO TOLD LIZZIE THAT THERE'S A BOOGEY MAN IN THE OUTHOUSE??!!!"
Summary: It seems to me that Mike never quite realized that the payoff of Dennis's shtick was not that he did stuff but that he never got away with anything. He's having fun being witlessly cruel now but he'll be whining "But MA!!! I was just havin' fun!!" in no time as he gets ass-whupping number 4038. (It's at this point, of course, that most of the people on ucomics.com who still think that they're where they're supposed to be will start to realize they aren't.)