When? I never saw him do it in Dragon Ball Z, that I can recall. Either way, I don't think the question was about that. You also missed that Vegeta never did even once. XD I think this was about something other than the series itself.
I was only giving one example, another is when he summons the dragon to find out how to become a super sayian god. Besides, I know what the poll is about, I already picked Roshi, but the point is he never did it in the show, Manga or movie
I was stuck between Oolong and Roshi, and though Roshi is more likely, I had to give the pig the benefit of the doubt. It coulda been a world-saving wish, like when he wishes for "the world's most comfortable pair of underweaaaaar!"