Is it normal to laugh when you remember something funny?
Yep.Totally normal
Yes. Laughing when a funny memory pops into your head is completely normal; your brain is basically replaying the joke for an audience of one.
Funny memories can bring back the same amusement you felt at the time, so you might grin or laugh even when you’re by yourself. Lots of people do this, sometimes out loud and sometimes just in their head.
Other people might wonder what you’re laughing about, but that’s usually the whole mystery. You can tell them the story—or keep enjoying your private rerun.