"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.
Aidan's hallucination of Bishop criticizes Aidan's choice of internal decor, claiming he's gone soft.
Bishop: Is that a cat wearing a catcher's mask? That's cute... Aidan, you're cute.
The cat statue in question becomes a running gag in subsequent seasons. Aidan dances with it in season 3, Kenny 'borrows' it in season 4, and in the last episode before the series finale, the roommates bicker over who gets 'custody' over it and wonder for a surreal moment if it's sentient.
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 grabs a spatula for self defense, 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Aidan's incredibly out-of-date dancing during the party he throws, which becomes even funnier when you realize he probably learned those moves back when they were still popular.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...
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 Victory Dance after escaping from Donna the witch. "I did it! I did it!"
Nora calling Aidan's fake autobiography "dorbs." And then her declaring his high school nickname is "Chuggy."
When Sally discovers a secret room, Nora asks Aidan for his sledgehammer. Cut to Aidan busting through the wall with his entire body, shouting 'Oh yeah!' in reference to the classic Kool-Aid guy commercials. He's disappointed that it doesn't get much of a reaction from Josh.
Earlier in that scene, Nora walking in on Aidan's morning wood.
Every line of dialogue from the scene in which the roommates divvy up their possessions after getting evicted from the house.
A conversation between Nora and Aidan about the difficulties of going on vacation as a vampire:
Aidan: And then there are some places like the Bahamas where I just can't go
Nora: Too much sun?
Aidan: I killed their prime minister once. Bahamanians have a really long memory