Of all the grammatical slips that really bother me, few....

Of all the grammatical slips that really bother me, few compare to an improperly used "they."

This mysterious unnamed group, "they," is held responsible for untold problems. Bad news tends to be delivered in the third-person plural, whereas good news is much more likely to be relayed in the first-person singular.

Richard Branson
Taken from Entrepreneur Magazine