People that use something like Twitter to narate their lives. I honestly doubt the world cares to know how long you were on the toilet, or what you had for breakfast.
In addition to alternating caps and substituting letters, numbers and symbols, I'd add intentionally (and continuously) misspelling words. And multiple question or exclamation marks in a row.
Modders (or any entity) putting their "names" in their projects' titles irks me as well.
That bloody lolspeak. (alright on a picture, but in the comments, no)