Almost any interaction between Butch and Vishous. Especially the potato launcher incident.
In Lover Enshrined Qhuinn slices his cousin, Lash's throat open in defense of his friend, John Mathew, and is later called before the king, Wrath, to explain his actions. His first thoughts are riotously hilarious, sarcastic answers, among which include (paraphrasing):
Qhuinn:I was just trying to give him a shave. I had no idea if you opened a sieve in someone's neck they'd be in danger.
Rhage gets a lot of good one-liners and completely off-the-wall jokes too.
"I'm still convinced you've been doing my GTO, you bastard!" from Lover Eternal, page 250. Vishous mentions how since he grew a goatee Rhage has been heckling him about French-kissing a tailpipe. Cue above rejoinder from Rhage.