[The window to the house opens up, and Rarity's head comes poking out. She seems to be wearing that standard expression of vague annoyance that comes with dealing with her little sister.]

Sweetie Belle! I'm very busy right now, and I'm afraid I don't have time to play with you. I've told you a hundred times not to interrupt me while I'm working. I know you get bored, and I can certainly appreciate that, but you can't always expect everypony to be able to simply drop everything just like that simply because you can't find anything to do to entertain yourself.

[huff]

Really now. Go run along and play--