Refer to this thread when using Your, You're etc...

[voodooman]

Official Grammar Police:
Listen up you fuckin morons: here's what it comes down to:

you + are = you're
(i.e. You're all fuckin morons for not having learned this simple concept in elementary school.)

Your = your bike, your car, your lack of intelligence, etc.

Their ignorance fucking makes me sick.
They're probably working at a gas station.
There, I fuckin said it! Now utilize this knowledge I bestow upon you, you short-yellow-bus-riding tarts!