HTIS commonly affects those with a lack of intelligence on the "interwebz." There are many symptoms that show that a person has HTIS. Symptoms may include itchy balls, peeing vomit, crapping kittens, and listening to Fall Out Boy. It may also result when a person misspells "this."
Shit, man. I was talking to my girlfriend online and I'm afraid to say it but. . . I think I have HTIS.