「ねえさーん、『けんかじょうとう』の『けん』ってどう書くんでしたっけ？」

"Nee-san, is that how you're supposed to write the 'Ken' in 'Kenkajoutou'?

TL Note: 喧嘩 (kenka) means a quarrel or a fight. 上等 (joutou) technically means "excellent" but colloquially often acts as a sort of invitation. Thus, Pepperoni is imagined as trying--and failing--to write "bring on the fight!"