<pedantic rant>
My boss, who is educated, intelligent, and very capable has a bad habit of using 'nothink' and 'somthink' (I missed out the e because thats how he pronounces it!).
I don't bother to say anything as, if he finds something that annoys me he loves to wind me up deliberately ;-)
Recently he discovered my hatred for people using the word 'asterix' when they mean 'asterisk'. Soon the whole office was asking me how many asterixes are in f***k *ff!
Also people who say least when what they mean is fewest. This seems to be a common crime on the current rash of "vote for your favourite" type shows. You hear the presenter say "and the contestant with the least votes will be going home" No! the contestant with the fewest votes, or the contestant with the least number of votes will be going home!
Why can't the english teach their children how to speak? (Hmmm sounds like a catchy line for a song...)
</pedantic rant>