Bear Necessities

 is an unmarked quest in Fallout: New Vegas.

Quick walkthrough

 * 1) Talk to Lindsay, a child Boomer at Nellis Air Force Base.
 * 2) Find the teddy bear Mr. Cuddles.
 * 3) Return to Lindsay
 * 4)  Tell Lindsay that Mister Cuddles is dead with speech check of 60, which results in Boomer Infamy and loss of Karma.
 * 5) Give her the bear, for Boomer fame.

Detailed walkthrough
Head into the Hangar where Loyal and Jack hang around. There will be a large circle of crates next to the benches near the entrance. Walk around these and look through the corners until you find Mr. Cuddles. Take him back to Lindsay (she could be in one of the living barracks or in the schoolhouse) and speak to her. At this point you have the option to lie and say Mr. Cuddles is dead or just give her back to her.

Behind the scenes

 * The name of the quest "bear necessities" is likely a reference to Disney's movie "The Jungle Book", where "The Bear Necessities" is a song.