How to Use There, Their, and They're Properly

In my day job, I receive mass quantities of email. Much of it comes from CEO's, VP's and other "intellectuals" I work with in various industries. However, I want to reach through this fucking monitor and choke the living shit out of people that REPEATEDLY use the three words above improperly. Don't get me started on the people that don't even know how to use sprell chec.

For all you mental midgets out there, I'll break this down for you.

There: Used to represent a place. You should use "there" if you can replace it with "here", and your sentence still makes sense.
Example: The plane crashed right there.

They're: A contraction which can be used in place of "they are".
Example: They're not doing as well since they moved to New York.

Their: An adjective used to show possession.
Example: Their pizzas had pepperoni on them.

Three different words which are not to be used interchangeably. If you are going to try to portray yourself as an intelligent person, please at least try to get these three simple words right. You are hurting my brain.

Originally Posted late 2006