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Fallout 3 Hints
The Infinite Joke
1 of 7: This isn't so much an undocumented quest as it is an unlimited XP glitch. It's still unfixed as of the version 1.7 patch.
2 of 7: Go to Little Lamplight (location 11 on the Zone 4 Map) and enter the Lamplight Caverns area.
3 of 7: Get Mayor MacCready to open the gate that he's guarding by using the Child at Heart option (if you have that perk), passing a tough Speech Challenge, or doing the "Rescue from Paradise" misc. quest.
4 of 7: Once you're in, find the kid named Knock Knock and talk to her about being in charge of morale.
5 of 7: Do her stupid knock-knock joke, then use the Speech Challenge option when it comes up.
6 of 7: You can then talk to her about morale and go through the same joke to get the same Speech Challenge again.
