The three little words, THERE, THEIR, THEY'RE, are probably abused as much (or more) than any other words in the English language--I see them used incorrectly on a regular basis, along with scores of other errors. A friend on Facebook sent me the cartoon because I am . . . well, a self-described Grammar Nazi. I am proud to be a Grammar Nazi. After all, somebody has to do it! We have to root out illiteracy and shoddy syntax wherever we can, right?
There, their, they're--you'll find another job--maybe.