A joke or tidbit meant for people knowledgeable in a certain field

Nerds Are Sexy

it is interest and intellect that makes the nerd

intelligence is very, very attractive

cute, shy, and vulnerable archetype as applied to a nerdy girl

cute and brainy bibliophile

wanders around with her head in a book

Booth: All right, what I want you to do is take off your glasses, shake out your hair, and say, "Mr. Booth, do you know what the penalty is for an overdue book?" Brennan: Why? Booth: ...Never mind. —Bones

tend to prefer more intellectual pursuits

character traits (nerdy, shy and sexy)

physically unimposing and soft-spoken, but with Hidden Depths of formidable physical and practical skills

when two or more different pairings benefit one another

This is where no one is exempt from being killed, including the main characters

multiple deaths, happening at different points in the story

No competition, no rivalries