We were not expecting this at all.
Kate Cavender was watching her baby on the monitor when she started hearing something really strange. Well, not as much strange as unexpected.
And obviously the mum took out her camera and started recording - and we are so glad she did.
So what was it that she heard?
Well, it wasn't anything creepy if that's what you're thinking... it was more hilarious.
Listening in closely, the mum could hear her one-year-old son laughing hysterically!
"My son had been asleep for a few hours when he started laughing, slowly at first," Kate explained under the video posted to YouTube.
"And then laughing so loud I thought he was awake. I checked on him and he was sound asleep!"
This is actually one of the best things we've heard in a long time!
Has your little one ever done this?
