Harry reached over and tousled Faustus's hair. "We'll only play fun pranks not mean ones." Harry assured Faustus. "The Hufflepuffs can appreciate a good laugh. The Slytherin's we'll just hide from." He told Faustus after Severus made his comment about his Slytherins.
He still didn't agree about the detentions though. "And just some advice Faustus, never get detention with your Dad. I still can't get the smell of gross cauldrons out of my head." Cleaning cauldrons was something Harry would be very happy to never do again.