How many CIA agents does it take to screw in a lightbulb?
They don't need lightbulbs--they glow in the dark.
Listen up, smarty pants! This joke implies that CIA agents are so super-secret and advanced that they don't need lightbulbs because they can literally glow in the dark. It's like saying you're so cool, you don't need a jacket because you're always hot. And just like you, this joke is trying too hard to be clever.