I am wrong about Guildenstern and laughing in this bit. I just glossed right over the “ye” in this sentence I have always heard it as you, read it as you – just assured it was you. But it is “ye.” So Guildenstern must have laughed too and Rosencrantz answers the charge.
It is amazing what one little word can do to change things. A Guildenstern who laughs is very different Guildenstern than one who doesn’t.