From Amy Kate’s recent post:

Club Medusa is closing it’s doors for good. It’s [Saturday, Nov 26] your last time to party at one of Seattle’s most Legendary spots.

More often than not, the possessive its is rendered with an apostrophe, even by intelligent people who should know better. If you haven’t noticed by now, this sort of thing drives me crazy. Do American schools no longer teach this distinction? As Dubya memorably asked, “Is our children learning?” [sic]