When Emily visits the house for the first time, her timing could be better. Aidan's just gotten a vampire snuff film, Josh is trying to date for the first time and unbeknownst to him has a vampire stalker and Sally just found out that her fiance killed her and she's not taking it well. The entire house is shaking, Aidan and Josh are quietly freaking out and Sally's just trying not to bring the house down.
Aidan: That's the T...train! T-TRAIN! (scurries upstairs)
Aidan 'fanging out' when visiting Josh's home, and his subsequent freak-out. Apparently garlic can't hurt vampires, but it can reveal their true nature.
From "You're the One That I Haunt"
Nora: "You totally impregnated me... with a tiny huge headed alien."
From that same episode, Josh's reaction to Evil Dead's Sally.
Josh: If we videotaped Sally right now and showed somebody, they'd be dead in three days.
Sally: "You two are totally about to go on two separate killing sprees for women. That is so hot."
On a related note, Sally doesn't want Josh to kill Ray with a gun, as she fears it will ruin his (& her's) favorite shirt. Cue her asking if he could run Ray over with a lawn moweras a possible alternative.
Josh during the dinner party with Sally's recently-deceased mom and her boyfriend, particularly the expression on his face as he leaves. He laments the fact that he keeps cooking dinner for people who can't eat and downs two glasses of wine like shots.
To top if off, from what we've seen, he's actually a pretty good cook too.
In a dark way, the scene where Josh tries to get Aidan to drink his blood in order to prevent him from doing the same to Zoe, at least until it goes horribly wrong. The look on Aidan's face as he tries to force himself to bite Josh's wrist is just so much like a kid being forced to eat some nasty vegetable.
The first episode when the guys first meet Sally. First, Josh freaks out because someone is in the house, and then Sally's comments when she meets them and doesn't realize they can see her, while they don't realize she's a ghost.
Sally: I am God. I am everywhere. I drive all night just to get back home.
Aidan's incredibly out-of-date dancing during the party he throws, which becomes even funnier when you realize he probably learned those moves back when they were still popular.
In a Black Comedy sort of way, when Josh and Nora dissperse the two ghost girls in the house, we promptly hear Sally scream in shock before coming down and chiding them about doing that. Since of course, the ghosts reappear where they died and since they died in the room Sally is using...
Josh's rather odd reaction to discovering Stevie's fate.
Josh: "He killed and ate a United States postal worker!"
Sally making fun of Aidan for being "backed up."
Double points for Sally being in a rather nice looking outfit and the two of them having already had a Ship Tease before.
Aidan pulls Kenny aside after Kenny absentmindedly drops hints to Emily about how awesome things will be once he's turned:
Aidan: "First rule of vampires: do not talk about vampires."
Sally trying to take a bite out of Aidan's muscular torso, though that comes with plenty of Squick.
Sally: "It's like trying to bite through a tire!"
Sally's deathbed vigil, which comes chocked full of Gallows Humor.
Sally: "Hold my skeletal meathook of a hand."
"Hey, you know what? Screw the keg, why don't you pick us up some crack?"