Tonight with your 5 to 8 year old
The prompt
“What's a memory of us two laughing so hard it actually hurt?”
What to listen for
If they remember it easily and can describe details, that moment clearly left a real mark, and they're showing you how much joy with you sticks with them.
If they struggle to recall one, that's not a bad sign, just an invitation, you can offer one you remember and watch their face light up with recognition.
If they say "I don't know," ask about a time something went hilariously wrong, since those often stick best.
What this tells you
Whether they can easily recall a shared laughing fit shows how much joyful connection with you has become part of their sense of security.