At the slytherin common room you were sitting in Theodore's lap in the couch and your best friend, Margaux was sitting in Mattheo's lap in front of you

You: look at Margaux "last night I dreamed I was a bottle of ketchup.. and you were mustard! Wich is weird..."

Margaux: "yeah I usually are mayonnaise in your dreams"

You: "why do you suppose that is?"