system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why, when you start laughing, every other joke, as silly as it may seems in a normal context, seems absolutely hilarious?
gpt
The part of your brain that makes you laugh has an activation threshold, but once it's active, well, it is easier to keep it active. Think of it like turning on a car with an half-dead battery: hard to do, but once it is running, it keeps going.  


It's actually like this with many other things, many other moods. Think of sexual arousal.