Because it's Friday.
Because I haven't had enough coffee yet.
Because a surprising number of folks need it...
Here is a quick little grammar lesson.
Your: Posessive pronoun. Of or belonging to you.
You're: Contraction. You+Are.
There: Adverb. A place.
Their: Adjective. Belonging to, done by, or made by "them." Possessive form of "they."
They're: Contractive. They+Are.
Its: Posessive prounoun. Replaces His/hers/theirs, etc.
*Helpful hint with contractions: SAY IT OUT! If it doesn't sound right to say "you are" or "they are" or "it is" then you don't (do not) want to use a contraction. You'll (you will) want to use another word.