Me, shouting upstairs to DDs 1 and 2: "Come down, your tea's on the table."
(After only DD1, 16, has appeared) Me, again, to DD2, 15: "Tea's ready!"
DD2, coming downstairs: "Yeah, I fucking heard you!"
Me: "Don't you dare talk to me like that!"
DD2:"Sorry; I thought you were DD1."
Because that would have made it okay, then...
(They love each other, really. Sort of. )