Knock Knock

Sue "Knock Knock" is a girl in Little Lamplight in 2277.

Background
Knock Knock, previously known as Sue, and her twin brother Knick Knack were born in 2263. She is in charge of morale and keeping the peace around town, and does so by exchanging stories, and telling jokes.

One of her sources for her jokes was a book that was once retrieved from the nearby Vault 87, but has since been destroyed, which given the bad quality of its contents is not considered a loss by her. Knock Knock is also eager to hear new stories, as she is limited to events that happen within the community, since their scavenger teams usually stay hidden.

Daily schedule
Knock Knock wanders around Little Lamplight all day until she goes to sleep.

Other interactions

 * If the Lone Wanderer asks her for a joke and either laughs at it, or pretends that it is funny, she asks them for tales from the wasteland.
 * They can then tell her a total of three tales; the first one being about exiting the vault, the second one about James's sacrifice during The Waters of Life, and the third one about their own escape from the Enclave during The American Dream.
 * Regardless of the Lone Wanderer's Karma, they can tell her three versions of their story: good, neutral and evil. Whichever versions are chosen, she will proceed to share the tales with every other Lamplighter she comes across.

Appearances
Knock Knock appears only in Fallout 3.

Bugs
Lying to her that her jokes are funny can be repeated unlimited times for additional experience, this also counts toward the achievement/trophy Silver-Tongued Devil (50 Speech successes).