...Or Are You Just Happy to See Me?

...Or Are You Just Happy to See Me? is a challenge in Fallout: New Vegas.

Challenge requirements
Explode 25 enemy pants.

Effects
Grants 50 XP upon completion.

Walkthrough
Exploding pants is achieved by reverse pickpocketing a live grenade, mine or C-4 plastic explosive into an NPCs inventory and running away quickly to avoid being caught in the blast. A successful planting always kills the NPC.

As long as you remain [HIDDEN] and are not caught pickpocketing, it counts as a stealth kill so no other friendly NPCs will turn hostile and no Infamy will be gained with the NPC's faction. This means that the easiest way to complete this challenge is to stealthily blow up 25 unnamed friendly NPCs in friendly locations such as Crimson Caravan Company. Another option, Jacobstown, allows you to work on the Super mutant massacre challenge at the same time.

Frequent quicksaving is recommended as NPCs still have a chance to detect pickpocketing even with Sneak 100. Pickpocketing from as far away as possible and the Silent Running perk are also recommended to minimize the chances of being caught in the blast. Stimpaks and doctor's bags are also a good idea for when you don't get away quickly enough.

Behind the scenes
The name of the challenge is a reference to the famous Mae West quote, "Is that a pistol in your pocket, or are you just glad to see me?"