Bob's reaction to Molly showing up at Harry's door to shower. Giddy doesn't even begin to cover it.
Made even funnier in the audiobooks, where James Marsters' giddy Bob voice is absolutely hilarious.
Also in the audiobooks, whenever SPLATTERCON!!! is mentioned, James Marsters says, "Splattercon, exclamation point, exclamation point, exclamation point," in a somewhat deadpan voice.
When the team are gearing up to go into the Nevernever, Murphy asks who else he is bringing for help, to which Harry is evasive, pissing her off.
Murphy: You're enjoying this. You just love to dance around questions and spring surprises when you know something the rest of us don't. Harry: It's like heroin for wizards.
Harry's response to learning just how many Winter fae are coming to kill him.
Lea You summoned forth the power of Summer here in Arctis Tor, in the heart of all Winter. When you did so, those of Winter felt the agony of it. And now they come to slay you or drive you forth. Harry: Uh. How many of them? Lea: Why, all of Winter, child. All of us. Harry: Crap.