Take a look at LOL Comics for instance. It uses nothing but simple drawings and stickmen to achieve some of the most sidehurting humor I've ever read. Next to that you have XKCD which doesn't even show facial expressions yet you still understand exactly what emotion is being portrayed within the joke.
When I was little I made pictures using the same sort of simplified expression through body language with jots and tiddles. They were mostly of amusement parks as I had mentioned in an earlier post. I wanted to show what those pictures looked like, but I can't seem to find my old artwork anywhere at the moment, so here's a poor example of what it would look like.
Ending notes: For those who want to try making these I use Easy Toon which you can acquire here.