It's the last sound you'll ever laugh at.
Don't hit play!
The sound of this child's laughter will haunt your dreams! You'll wake up in the middle of the night, breathless from all the giggling you've been doing in your sleep.
YouTube user mooonez has the exact right title for this video: "Самый ехидный ребенок на свете! Child laughs as Troll." Go home and hug your loved ones because the Troll Baby is coming for you, and he is going to crack you up.