[ah, now Loki understands] You are a human like Stark. Are you going to stall, I mean threaten, as well? [yes, he's totally changing the subject because pop culture makes about as much sense to him as the speech of the chitauri. It's all just chittering]

I have attempted repeatedly to summon a handkerchief and repeatedly get uncommon and even strange objects, such as a small bag which expands when air is blown into it. [the description of a balloon when spoken of by some one who had never seen a balloon]