I remember one in 4th grade and we all made those pinhole things and went to see the beginning of it and then went to lunch. When we came back from lunch, the teacher gave us the thingys back and I got a different on that the hole had closed on. I told her I couldn't see through my hole and she was like, "We have to go inside!" I still hate that b**** for that!
I got to see the one in '94? through a welder's helmet, though.