Speaking of High-school, I have yet to see Leon confuse the
grammatically incorrect 'your' for 'you're'.

Example of the proper use of 'your' and 'you're':
You're a dick.
Your attitude sucks.

'You're' does not exist in the english language. ' Your' is correct
for both examples.

And don't get me involved in theis thread or I'll hit you with my
purse.