There are some truly cursed mods out there. I strongly believe, however, that I have found a contender for the most cursed mod ever created.
There is a mod for Monster Hunter: World on NexusMods that switches the Rajang's character model for that of the Admiral. In other words, you're fighting the commander of the entire fleet of human warriors, but on all fours acting as an overgrown monkey.
I hate and love this in equal measures. The mod works on the introductory cutscene for the Rajang in Monster Hunter World: Iceborne, where the Admiral faces off against the ferocious creature with nothing but a big rock protecting him from the stream of lightning from the Rajang's mouth. Note that in the footage above, the player is using the Player Rajang mod to make themselves look exactly like the big monkey, including using a Kirin's horn as a weapon.
The mod turns the hilarious art below into reality. I absolutely love the artwork below from the Monster Hunter community, and I guess the creator of the Admiral Rajang mod did as well.
Monster Hunter World: Iceborne introduced a ton of monsters to the base game towards the end of 2019 (or early 2020 for the PC). One of the these new monsters was the Rajang, but even after the launch of the huge expansion, Capcom still plans on adding new monsters and events to the game every month.