http://www.mangafox.com/manga/sket_dance/v15/c180/1.html
Funny as hell. I really laughed at what Gin bluntly said:
"No, Gin-san. Did you read Sket Dance?"
"Oh yeah! I know "Sket Dance"! Those Gintama knockoffs, right?
"YOU CAN'T SAY THAT!!!"
EDIT:
HOLY SHIT
After the Sket-Dance chapter ends with the Sket-Dance ending up in Gintama's world, it says "This is on Gintama pp.115!! HURRY!"
SERIOUSLY.FUCKING.INGENIOUS