There's a time and a place to laugh. You don't want to end up chuckling during an inappropriate time, or you could end up in big trouble. If you want to practice keeping a straight face in serious situations, then this is the video for you.

It'll show you a series of funny videos that you're not allowed to laugh or grin while watching. Are you ready for this challenge? Then you should press "play" on the video down below and see if you can beat it:

Were you able to watch the entire video without laughing or grinning?