You can never tell what will make babies laugh. They have a very contagious laugh, and when they are around, it is impossible to be in a bad mood or be worried about anything. They spread light around them and force you to smile.
The video bellow shows baby Penn, who is having fun with his caregiver. He is only 6-months-old in the video bellow, but already knows how to play games and have fun. When the girl drops the pacifier, Penn starts laughing and it is impossible to not join him.