I'm sure you've heard someone say something along the lines of "it takes this many muscles to frown, and only this many to smile", where less muscle activity for smiling makes it easier than frowning. Easier means you should do it? How about having no expression on your face? Isn't that alot easier. I think that's like ZERO muscles. Anyway, the point I'm coming to is that you shouldn't be doing it because it's easier. Doing somebody a favor, or helping someone in need, those things may be really hard to do, but worth doing nonetheless. Often it's better to do the thing that's less easy. The easy way is probably the wrong way. I think most of us have heard Jesus talk about something like that. The point I'm making is smiling is too easy, just frown at people, show them you are making an effort to do something for them!