When people consistently spell words wrong, I just have the urge to point it out to them.
For example, on another forum I frequent, one user was having trouble with the spolier tags. The user even posted a thread asking why none of his spolier tags were working, when they worked for everyone else. I took the effort of going through his last 20 posts, including the new thread, and highlighted every time he spelled spoiler wrong - he never spelled it right.
Sure, I can understand spelling spoiler wrong a couple times, especially considering I and O are next to each other on the keyboard, but over 15 times in 20 posts?