No glasses for today? You can still get by with a cereal box. Really - Nasa's video explains how.
Trace the bottom of the box in a piece of paper. Tape it to the inside bottom of the box.
Cut holes on the top left and right corners. Cover the left with aluminum foil and prick it with a pin to get your pinhole.
With the eclipse behind you hold the box infront and look in the right hole. You'll safely see the eclipse.