Words and grammar that (almost) drive me nuts!

Using "they" or "their" as a third-person personal pronoun referring to a singular subject. This happens all the time now, even on national news shows.
      A singular subject requires an "it," a "he," or a "she."
      Examples of bad usage: "The company sold their stock." "A student should turn their work in on time."

How many e's in "judgment?" Just one. It is not "judgement!"

But there are two m's in "accommodate." It is not "accomodate."

Pronouncing "escape" as "ex-kape," or "ask" as "axe."

Splitting the infinitive! An example from the Motorcycle Safety Foundation's range exercise 6:
      "to effectively maneuver the motorcycle."
      This should read, "to maneuver the motorcycle effectively."
      A more famous Star Trek example: "To boldly go where no man has gone before."
                  Should read "boldly to go" or "to go boldly."

"Orientated" instead of "oriented."

"Irregardless" instead of "regardless."

"Preventative" instead of "preventive."

This I really hate: "realator" instead of "realtor."

Also, "athalete" instead of "athlete."

"Wesconsin" instead of "Wisconsin."

"Like" used incessantly when it does not mean "like." Examples: "I'm like," "he's like," "it's like."

Using "since" when the writer or speaker actually means "because."

Using "principal" when what is meant is "principle," and vice versa.

How about "most unique." "Unique" says it all; it cannot be more unique than unique.

Americans think it is sophisicated to use British spelling for some words. It is not. It is dumb.
      Examples: In the U. S. it is "theater," not "theatre." It is "center," not "centre."
          Presumbly the British spellings would be pronounced, "THEE-a-tree" and "SEN-tree."
      And don't forget "towne," pronounced "TOWN-ee."