How will you get a shrubbery? Will you be successful? What will it cost you to get it?I want.... a shrubbery!
Thus the stakes are set. With comedy, the answer to those questions will likely be a reversal of expectations that are set up in a way that makes the audience laugh, just as the desire for a shrubbery (and not a pile of gold or something more typical of an adventure movie) is a funny answer to the stakes that proceeded it. Had someone just said "I want a shrubbery" in the middle of the film for no reason, it wouldn't have been funny.
Without stakes there is no conflict, without conflict there is no story.