Taylor Calmus built an incredible machine in order to reveal the sex of his second child - expected to be born in August this year.
The YouTube father at Dude Dad Vlogs took three days to build a Rube Goldberg machine (a complicated contraption that completes a simple task) throughout his house.
He shared the incredible video of the reveal on Facebook and it's been viewed over 8.5 million times in only a few days!
Watch the video of his incredible contraption all the way to the end to see how the new big brother reacts!
Source: aplus