Set Lasers for Fun

 is both a damage challenge and challenge perk in Fallout: New Vegas.

Challenge Requirements
Deal 16,000 damage with pistol grip energy weapons.

Perk Effects
You're laser-crazy and it shows! Minor bonus to critically hit with all laser weapons.

Your critical hit chance with lasers is increased by 2/4%.

Behind the scenes
Also the Taking Back Sunday song - Set Phasers to Stun
 * The name is a reference to the Star Trek line, "Set phasers to stun."