Crazy, Crazy, Crazy

 is a quest in Fallout: New Vegas.

Quick walkthrough
Find Neil at Neil's Shack and he will give you a mission. You will continue your way up the hill and exterminate the Super Mutant Masters and Nightkin. Once you arrive at the broadcast building, go out the back door pick up the key under the stairs. At this point you have two choices; kill Tabitha or repair Rhonda, the custom Mr. Gutsy, in the storage building.

Detailed walkthrough
As you appproach the Neil's_Shack A super mutant named Neil approaches you and starts automatically a conversation dialogue. He will inform you that an another Super-Mutant named Tabitha, has taken over the Black Mountain under her rules, and one of the rules which is clear to all of them, is, that none Human is welcome to the area. At the same point you will automatically obtain the quest Crazy, Crazy, Crazy which requires enter the Tabitha's room and eliminate her chaos. He will also let you know that the area is patroled from Super-Mutants at the daytime while at the night, Nightkin patrols the roads while they are stealthed.

With a Speach-Check of 50 you can convince Neil to assist you in the killing of Tabitha. If Speach-Check is succeful, Neil will reply that if you're able to reach the village at the north of the month you'll be considered worthy at his eyes and he will decide from there if you're good enough of having chances against Tabisha ( This information is irrelevant,since there's not factor included )

From the Neil's Shack you'll have to make your way up at the road that leads to the mountain, by fighting against 3 Patrols of Super-Mutants. On your way up, you'll find a body of an NCR Trooper. If you pay closely attention you'll see Bear-Traps exactly at his legs and all the way up to that Hill. Be careful to avoid Bear-Traps and falling rocks if this path is taken.

If you choose to avoid this short-cut and take the normal path, the 3rd Patrol of Super-Mutants will include also 1 Nightkin.

Once you reach the summit you can talk to Neil and he will help you fight the rest of the way, until you reach the Broadcasting room. Otherwise you can not talk to Neil and just venture on by yourself.

NOTE: If you continue past Neil, it is possible for a Glitch to occur where Neil will not be able to join you regardless of the speech options, always replying "OK. But make it quick."

Proceed through the Broadcasting room and out the other door. The key required for the upper level of the building is below the stairs leading to this level.

Alternatively, you can go in the storage shed and repair Tabitha's robot with a Science Skill of 60. Tabitha will be thankful and leave Black Mountain without attacking you.

Bugs
Neil the super mutant will tell you to meet him at the top of the hill. He will be located to your left right after you pass the crater (radiation warning). Talk to him when you see him and don't go running ahead. If you go past him and start killing the Nightkin, he will not help you complete the mission, he will be stuck in the same conversation. If this happens to you, you can still complete the quest. (confirmed Xbox 360)

In some situations, Neil won't spawn at all. Confirmed on PC.