I was going to make this a poll, but it just got too complicated for me and I didn't want to leave any options out.
The title is pretty much self-explainatory, no?
My favorites are the ones where she says "ittadakimasu" everywhere, and the one with her and what's-his-name from Hey!x3 in the taxi.
The restaurant one is cute, too, but I like the taxi one better. I think Ayu is funnier in that one, but what's-his-name is funnier in the restaruant one.