For me it is people who say "begs the question" when what they mean is "raises the question."
It irritates me to no end. I have seen it happen like seven times on these forums this week and it also happens with the editors on IGN all the time. Now typos, typos I don't mind because I often have a shit ton of them, especially when I am using the site on a mobile device. But "begs the question" does not even mean what some people think it means. At all. So those of you who do this, please stop. Do it for philosophers and logicians everywhere. Please?
So, what tiny insignificant thing pisses off you duders way more then it should?