Lampshaded in the Harry Potter fic Make a Wish where before beating up a group of Slytherins who'd cornered Hermione, Dobby made a remark about "taking out the trash" and when questioned added that "Mr. Black says that it's important to make witty remarks before battle, unless it makes it not a surprise."
"The only pony who can save you is Fluttershy...and since I can't bring her here, I'm going to send you straight to her."
In the Shining Armor Arc, Cadence gives one to Makarov when he dismissively asks if she's going to sing a song to stop him from killing Shining, right before she sings a The Villain Sucks Song that allows her to power up from the bonds between Misfit Actual and the Rebels kicks his flanks:
"I'm going to teach you a thing or two about love!"
"Good for the Good God!"
"You’re not buying this, are you?" "Not at all." "Well, then have I deal for you!" *Hits girl in face with axe* “A fire sale for all your axing needs! Get it? Because it’s a fire axe, and it’s in your face!" :laughs: "It’s funny."
“Hi, my name is Duke Elkington,” I groused, “and I’m a huge fan of cocks. You can tell from my cock-tasting spit. I’m like a chupacabra, but for dicks.”
Invoked: — “I wish I had a better one-liner to quip before I killed you. Like... uh, ‘Father always told me to fight fire with fire, which is probably why he got thrown out of the fire brigade.’” I laughed. “It’s funny because I set all these fires.”
And again: “Ooh, ooh, ooh, I’ve got a good one! Elkington, the last thing I want to do is hurt you... but it’s still on my list.
"A clear conscience is usually a sign of a bad memory."
Many of these are from chapter 12, and so are subverted because Jericho never actually kills Duke Elkington.