Ring-a-Ding-Ding!

 is a quest in Fallout: New Vegas.

Quick Walkthrough
Now that you know Benny is at the Tops casino located in New Vegas, it's time to go find him. Let him have it!

If you speak to Swank at the reception desk when you first walk into Tops Casino, he will reveal that he is friends with Benny. Pass a series of speech checks, and he will allow you to carry guns in the casino and give you the key to Benny's suite (and delay Benny from going up there while you look around). Go to Benny's suite on the 13th floor and take anything you want. Speak to Yes Man in the suite and he will fill you in on Benny's plan and the Platinum chip. Once you get this information, go downstairs and talk to Benny.

If you speak to Benny and choose the peaceful resolution option, he will give you the key to the Presidential Suite, and promptly send four bodyguards to kill you, fleeing the Tops Casino to 'The Fort'. If you choose to kill Benny in his suite, you'll have every bodyguard and dancer to deal with. If you kill Benny on the main floor of the casino, you should only have to take down his four bodyguards before things are peaceful again. Swank will then take over as boss of the Tops Casino. If you pass the speech check to get Benny accompany you up to the presidential suite he will make you an offer. You can accept or kill him, or do both.

[Black Widow Method] Benny will have a Black Widow dialogue option. Follow this chain of conversation to seduce Benny into taking you upstairs. Have sex with him, and then there will be an option to kill him in his sleep. No one else seems to mind or suspect you if you dispatch him this way.

Behind the scenes
The title of the quest is a reference to Frank Sinatra's 1961 song Ring-a-Ding-Ding.