This is absolutely something I would have done to my sister as a child. Actually, the only reason I wouldn't do it now is the fact that she would no longer fall for my chicanery no matter how deadpan my delivery was.
this reminds me of my Nana! Her number was almost the same as pizza hut and she used to answer it pizza hut, take an order & all. wonder how many people hate our pizza hut cuz they never got their pizzas :P