Microfiction

Has anyone tried his or her hand at microfiction? The idea is to create a story in 140 characters or less, which amounts to about two or three sentences. A number of new magazines are supporting this format, including Tweet the Meat (horror) and Thaumatrope (spec fic).  I sent off a few microfiction subs over the weekend, so we'll see how that goes. Kind of a fun experiment.