When your crush you’re still trying to find the balls to propose to is sitting on your lap. She noticed and now I want to die more than I did before.
When you’re among other people and wear pants that are not jeans
Realistically any time outside of a sexual context. Having a leaky glory hole or a Jehovah’s Stiffness isn’t exactly pleasant.
While burying the body…or is it the best time?
From the looks of it, most of the comments are using the question as a substitute for “Whens the worst time to get a boner?” and you aren’t wrong, but being horny is a mood and you don’t necessarily have to be hard or wet to be honry.
Having said that and sounding like a know-it-all douche, the worst time I would want to be horny is when I need to get something finished like homework or a project since it massively distracts me.