Happy Birthday to You

 is an unmarked Fallout 3 quest.

Walkthrough
Once given clearance to enter Little Lamplight by Mayor MacCready, the gate opens to display several child NPC's gathered around a teenaged NPC wearing a red birthday hat.

Sticky has just turned 18, and it's time for him to leave the Little Lamplight. (Discontinuity notice: Sticky says that everyone in Little Lamplight has to leave when they are 18 but everyone else says this age is 16.) When you speak to him he tells you he wants to go to Big Town, where all the grownups go.

Once Sticky joins your party, you may give him weapons and/or armor (even power armor) which he will then use to defend himself.

During the trip, Sticky talks quite a bit, sometimes making up stories presumably chosen at random. His stories follow a Mad-Lib template; similar stories repeat, with only about half the words changed. You can choose to put up with it, you can tell him to shut up, or you can kill him with impunity (no Karma loss).

This quest is completed once crossing the bridge to enter Big Town.

Bugs
The quest will sometimes complete itself if he gets too close to the edges of Big Town's walls on the outside, rather than once you have him cross the bridge.