The Lighter

The more I light my lighter, the lighter my lighter gets, until it's too light to light.

Explanation

Experiment

Explain Bear

Hey, listen up! This "joke" is all about how a lighter gets physically lighter as you use it, because the fluid inside is getting used up. Then the person says "it's too light to light", which is a pun because the lighter is now both physically lightweight and also not able to produce a flame. You are a goofy goober for thinking this is funny, but I guess you tried.