There’s a Russian saying, “Your friends are the ones who can tell you ‘no.’”
It's a joke, but the humor exists because it illustrates the idea that the people really like their enablers. Not everybody would find the joke funny, though I have no idea if Americans in general find it funnier than people from other cultures.
Another stab in the same general vicinity is: "A friend will help you move. A REAL friend will help you move a body."