It seems to me that recently there has been an upswing in commercials that appear to actually be meant to last for less than a tenth of a second. I first started seeing them on the Late Show with Stephen Colbert, the first one being an ad for Greenpeace which would pop up after a car ad or whatever. It was just the Greenpeace logo on a black background, and was clearly readable. I have also seen the same length of "ad" that just said it was paid for by such-and-such family, showing that family playing a board game in their living room.
I have also seen ones that seemed to be cut off from the end of fund raising ads, notably one for Doctors Without Borders, which was much harder to latch onto in freeze frame mode on my DVR than the first two examples. Are these all just cut off bits of longer ads?