The Unus Annus Space Program

Summary
After drinking two large bottles of Doctor Pepper off-brands, Dr. Dynamite and Canada Dry, Mark and Ethan fill up the now empty containers with baking soda and vinegar to make bottle rockets. In the final scene of the video, Mark's rocket is edited with a chroma key technique to appear as if it was leaving the Earth's atmosphere and landing on Mars a few moments later.

Trivia

 * The video opens up with Mark noting that they're not experts on creating homemade model rockets, which is then followed by Ethan singing a slightly modified, shorter version of the disclaimer song.
 * When Ethan accidentally mispronounces Dr. Dynamite as Dr Disrespect, the screen cuts to a quick shot of the aforementioned individual, accompanied by a screen shake and a notice that reads: "Ethan banned Dr. Disrespect comfirmfed!" This refers to Herschel "Dr Disrespect" Beahm IV, a prominent streamer who was banned from Twitch on June 26, 2020 without any specified reasons.