'did you say something?' (said in a rhetorical way when you try to mock someone if you disagree with what they have said or think they are talking a load of nonsense) [colloquial]
so you think you are haggling for vegetables at a market is it? (said in a manner to express that one going to stand firm and not going to accept any lower price offer) [colloquial]
surely it can't be; it can't be true, can it?; you must be kidding; you gotta be serious; seriously? you got to be kidding!; really? That can't be! [colloquial]
surely it can't be; it can't be true, can it?; you must be kidding; you gotta be serious; seriously? you got to be kidding!; really? That can't be! [colloquial]