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There’s no telling what a baby will find funny! One little boy couldn’t stop laughing when his mom tried to scare him.

Mom Tracey Saragosa told ABC News that her son, Marino, laughs hysterically every time she says “boo.”

She says it’s the only video she has ever posted to YouTube, but it has since gone viral.

“Everybody loves a laughing baby. I’m sure there’ll be other videos to come because he’s such a happy baby,” said Saragosa.

This video also reminds us of our favorite laughing baby video of all time — Baby Ethan, who couldn’t stop laughing at ripping paper. Watch the adorable video below.