Yours is more amusing than mine, but... I just remember that (possessive) pronouns don't have apostrophes. "My", "your", "his", "her", "their", and "our" don't

Yours is more amusing than mine, but... I just remember that (possessive) pronouns don't have apostrophes. "My", "your", "his", "her", "their", and "our" don't have apostrophes, so why would "its"? Meanwhile, contractions do have apostrophes. "Haven't", "should've", "that's", "you're", and "I'll" have apostrophes, so "it's" (meaning "it is" or "it has") should too.