For the similarly-titled Season 2 episode, see Happy Halfiversary.
"Happy Twelve-iversary" is the twelfth episode of OddTube Season 2. It premiered on August 26, 2020.
Omar, Opal, Oswald, and Orla say the phrase and slide down a slide.
- This episode is the season 2 finale of OddTube.
- The song from the previous season of OddTube's finale, "20th Anniversary Video", plays in this episode.