Level 1 – You’re a kid, you just laugh at things because they are funny
Level 2 – You’re a teenager/miserable & cynical person. You need a reason to laugh at things. “Why is that funny?” is you’re favourite phrase.
Level 3 – You realise that level 2 is for bellends, and just start enjoying and laughing at things with no logical justification again.
Use your limbic system for humour. Not your neomammalian brain.