I remember when
The 'I remember when' rule is when someone posts a baby picture and suddenly everyone's grandma is back from the 70s and wants to talk about their kid's kid.
My niece posted her kid's first steps and now 12 people are arguing about who has the best grandbaby.
He posted his dog eating a sock and 8 people started a debate about whose dog is the most ridiculous.
She posted her grandchild's birthday and now 5 people are telling her they had the same kid in 1993.