Disclaimer: I'm a cheap imitation JKR.
A/N: This is based on one of many strange inside jokes I have with one of my friends (her account here is under the name caecandy.) She got the original idea from a movie she watched that I don't know the name of, and which I also don't own.
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"Sirius, do you concur?"
"With what, mate?"
"You don't need to know!"
"Yes I do!"
"Just answer me: do you concur?"
"With what?"
"Gah! People these days!"
"...Pete?"
"Yeah?"
"What d'you reckon that was about?"
"I dunno, but you should've concurred!"
"He didn't tell me what I was supposed to be concurring with!"
"So? Now he's mad at us!"
"What, so I'm supposed to agree – concur – with him just to make him happy?"
"Well, yeah."
"You know, Wormtail, you place too much value on people's opinions of you."
"Well, if you're gonna be like that I think I'll go hang out with James – I, at least, concurred!"
"Hmph."
"Hmph what, Paddy?"
"Well, Moony, it's just been a hmph-y kind of day. First James started asking me if I concurred, and, you know, he didn't give me anything to concur with, so I had to say I didn't, and he stormed off. Then Peter went off on me saying I should've concurred with nothing whatsoever, and I told him he cared too much what Prongs thought, so then he stormed off. And I haven't done anything to either – why are you banging your head on the table?"
"I've just realized..."
"Wait! You're not going to storm off on me too, are you?"
"No, Sirius, I'm not."
"What is it, then?"
"Well, last night James came in asking to borrow my dictionary."
"Why would you have a dictionary in the dorm with you?"
"None of your business. But the point is, he was muttering about 'his Lilykins.'"
"So you're saying dear old Jamesie was looking up random words to impress Evans?"
"Yep."
"Well, that backfired on him."
"... I concur."