Two kids are playing tag. Let's name them Danny and Richie. Danny is it.
Danny tags with Richie with his right hand.
"You're it!" "Actually, I've decided that it only counts if you tag me with your left hand." "What? That rule makes no sense." "It's my house so these are my rules."
4 minutes later, Danny tags Richie again, this time with his left hand.
"You're it!" "Actually, I've decided that it only counts if you tag me with your right hand." "You said it only counts when I tag you with my left hand!" "I don't get why you're mad. You were okay with tagging with the right hand earlier." "You're just making up rules!" "Nuh-uh! I'm just going by what you wanted before!"