Wow, that is simply a funny mental image. Some poor fella has been gay and gets on Ivermectin, he then wakes up and finds out he isn't gay. That would be a hilarious skit. It isn't unprecedented that a parasite can change your mental condition, not just decline, but altering your thinking in a much deeper and more intelligent way. Take a look in to Toxoplasmosis and the Toxoplasma gondii parasite. It actually makes you like cats because the cats are essential to their reproductive cycle. Super wild.