photography mysteries

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I was taking some closeups with my om4 camera with a 50mm macro lens. There were some small daisies growing in the grass. They were about 1 cm wide, I took some shots and when I got my film developed there were 2 black frames, one good one and then one more black one. The black frames had not received any light and were totally unexposed. The advance mechanism worked fine throughout the roll.It should not have advanced if the shutter han not been tripped. Any thoughts ? I joked that it had been a miniature flying saucer hiding in the grass and it had shot a ray at the camera or something like that. But seriously I'm still wondering..