My grandson did this. They were staying with us and had a tv on top of a chest. He was changing the channel. Fortunately when it fell the chest went with it at an angle and missed him. It really scared us though.
Omigosh. I'm glad it missed - but it used to be that chests of drawers themselves were the things that most often hurt children seriously, I think.
Kids take the drawers out and play in them, or climb the empty compartments like ladders.
In the case today, the grandmother was sitting right there, but the toddler did it so fast she couldn't get to her in time. Takes quick reflexes to keep up with babies that age.