Having not done the advance planning needed to procure a pair of the dorky-but-necessary goggles for directly looking at the eclipse, I did the quick-and-dirty version instead: creating a "pinhole camera" by taking two index cards, punching a hole through one with a needle, holding them a couple of inches apart, and adjusting the distance between them until I got reasonable focus.
Quite neat -- while not nearly as spectacular as being in totality no doubt would have been (both my parents and my boss flew to the Carolinas for it today), it provided a good firsthand illustration of the principles as the visible dot in my "camera" went from circle to crescent over about ten minutes or so.
The one negative observation: I am now nearsighted enough that actually observing this now requires taking off my glasses. (Even my bifocals aren't good enough to resolve that level of detail. But at least my eyes are Really Good at Up Close and Tiny nowadays.)