“I was mispoyel by the power of Niagara Falls.” (Weiser)

“I'm not mispoyel by the shoddy new building the yeshiva put up.” (Weiser)

"And I want you to know, that I have a strong feeling that the manner in which I said Tehillim you will have a refuah , just like the Gemara says when someone was mispalel for someone else it was through his tefillah that he felt whether there would be hatzlacha or not." (source)