Seth Rogen is perhaps the most famous stoner in the world right now. But is he skilled enough to try a gravity bong?

A gravity bong is basically a method of using two containers, usually plastic bottles, to funnel marijuana smoke through water and into a person's lungs. Rogen was using what looks like a pretty intricate gravity bong set up, as you can tell from his facial expression that looks like someone discovering alien life. 

Things don't go quite as planned for Rogen. Although the video cuts off, Rogen said he coughed for 20 straight minutes after hitting the bong with his wife laughing at him the whole time.