Two weeks ago, TikTok user johnson_fran posted a video asking TikTokers not to duet videos if they have nothing to add. But this time, TikTok users definitely had something to add, making arguably the funniest video duet chain. Note: Duet-videos are a function of Tik Tok, where one can show his reaction to a video. The screen splits down the middle, showing the original video on one side and the 'response' on the other.