WATCH: Dad engineers incredible chain reaction to reveal baby's gender

Is it a boy or a girl? Actor and comedian Taylor Calmus and his wife are expecting their second child, so the father spent three days setting up a gender-reveal Rube Goldberg Machine—a series of contraptions setting off a domino-like chain reaction—throughout his entire house to answer that question.

Calmus set up the chain reaction had his son set it off by knocking over his sippy cup to launch the gender reveal into action. The chain reaction covered the entire house going through the nursery, bedroom, living room, kitchen, garage, and even down two flights of stairs.

The reaction ended with an explosion of confetti announcing the gender of their baby. It’s a girl! The excited couple is awaiting their baby’s arrival in August.

Calmus posted the video to his Facebook page Dude Dad Vlog by Taylor Calmus where the “comedian/actor turned father” posts videos about his adventures in parenthood.