Volume 1: Y's secret to Being Right
Y: have you seen the Sellotape?
Me: Sellotape??? What in the world is sellotape.
Y (dumbfounded): SELL-O-TAPE. Tape. Cellophane tape.
Me: I mean, I figured that's what you were talking about, but... sellotape? Who says that?
Y: Um. Everyone?! It's like Scotch tape. Here, let me repeat my question in a way you'll understand - (puts on his best redneck voice) Daci, have you seen that there sticky stuff?
Me (furiously googling "sellotape"): Wikipedia says it's a British tape brand.
Y (triumphantly): See!
Me: See?! What are you talking about? We don't live in England!
Y: So? Everyone knows that brand! (Sits down at computer innocently.)
Me: Everyone in your house knows that brand**. I get why you called it Sellotape now, but you are not allowed to get mad at me for now knowing what it is!
Y: Oh really?? Why don't you read the Wikipedia page... again.
Many Americans refer to Scotch tape as Sellotape, becuase [sic] the brand is universally recognized as a pseudonym for clear tape.
That's right, people. Y changed Wikipedia to win an argument. I think that is a testament to how awesome I am at being right. And, by the way, Wikipedia hasn't changed the entry back yet, so if you'd like to try this little trick at home, it might just work for you too.
**Y's dad is British - other fun phrases I've had to get used to include "having a lie down", "film pod", "sweeps", and "riding my footcycle".