My sister, Rebecca, is a speech language pathologist. When she visited our mother, she was teaching her how to strengthen her lungs by breathing through a straw. It started out as a pretty serious exercise as you can see by the pictures below, but just wait until you get to the last one.
I'd like to see you look at someone while breathing through a straw a holding your nose and see how long you can keep a straight face!
(Did this make you smile, too?)