It absolutely slays me when I am reading a forum or blackboard or whatever and someone sarcastically uses the word genius to describe someone else and they misspell the word genius. It usually goes something like this:
“Oh right, genious! Gawd, your such a looser!”
or
“Well, if u r such a genuis then y r u so stupid. Stupid u r! Hahha!”
Yeah, that pretty much slays me.