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
A super mutant named Neil approaches you when you're near his house. He asks you to help him bring down the Tabitha. Tabitha is a super mutant who rules over Black Mountain.

You have to fight your way up the mountain. You will encounter many super mutants and Nightkins. It is quite a tough battle so bring lots of ammo and stimpaks with you.

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.

Once you get to the broadcasting room enter it and go out the back door and look under the stairs and you will find the key to Tabitha's room. Pick it up head up the stairs, open the door and kill Tabitha.

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.

Extra Details
When you fight your way up to Black Mountain you will encounter a Nightkin Sniper. Once you kill the sniper and loot his body you will find Annabelle on him.

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.

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