we begin in eastern contra costa county. >> reporter: imagine having coffee on your waterfront deck, you look ought on the distance and see -- out distance and see a funnel crowd dropping from the sky. it happened to one guy here today, and he showed us the photo evidence to prove it. >> hear what i thought was thunder. curious, i go outside to look. >> reporter: carlos grabbed his compact camera. >> and this is what i see. >> reporter: in eight minutes, carlos snapped 11 pictures. >> this little triangular shape. to see this come right up in front of you, it was surprising. and fun....