Daft Laugh - A laugh that's so silly it's like you're in a mental institu

A laugh that's so silly it's like you're in a mental institution.

I gave a daft laugh when my dad told me he was going to become a magician.

My cat had a daft laugh when I tried to make it wear a hat.

My neighbor gave a daft laugh when I told him I was going to build a treehouse in his backyard.