This is a funny phase to say together. It’s not the most natural response to “For, by my fay, I cannot reason.” Maybe “Shall we to th’court?” Okay – maybe. It’s just so oddly solicitous all of a sudden and it seems more like something someone in service would say. A butler, a footman, a waiter – whatever. It’s weird for Hamlet’s friends to say it and even weirder that they say it at the same time.