Why is the spelling of you're confused with your so often? I read a lyrics sheet tonight for a song in which a woman implores a man to "say your (sic) my baby."
"It should be you're," I said to my cat, Collette. "How do people not know when to use the contraction of you are?"
Collette then set out to bite the person(s) responsible for the error. I told her that wasn't necessary, but I was pleased that such a silly mistake irked her, as well.