Oh, it's just some nonsense we say to talk about something that's unbelievably great.

( she waves it off with a laugh. she, too, isn't even sure bees have knees, but isn't that the point? impossible things. amazing because they might not be at all.

with a purse of her lips, she looks at him again and cocks her head to the side a bit. )

Don't you have any funny expressions you use where you're from? Something silly?