Everyone likes a bit of a challenge when it comes to a boss fight. After all, you want to feel like you overcame your enemy with the skills you learnt, so a cheap win is pretty much the square worst.
And while the popularity of franchises like Dark Souls make it clear that a lot of gamers live to suffer, some go a step further than you'd ever expect - or really want them to.
Be it that the fight takes a ridiculous amount of time, is impossible without knowing some obscure fact, or just that the fight is broken, plenty of boss battles are infamous for feeling like the odds are stacked way too high against you.
Admittedly, when you do beat these baddies you feel like the kind of grizzled veteran that Solid Snake would be intimidated by. But it's usually at the cost of feeling like the dime a dozen henchmen he guns down for hours beforehand, which perhaps isn't the most fair exchange.
In some cases, this has even prompted players to build conspiracy theories that some fights were made purposefully unbeatable, as appears to be surprisingly common in MMORPGs. Even when they're not, it's easy to feel as though they are, because there's no way you're coming out of the fight unscathed - both literally, and mentally.