What the?

I saw it the first time, I thought it a lie
the second simply a trick of the eye
but as it is said the third times the charm
and at first I did fret that it would cause me harm

but as it came swiftly like a beam of light
it fell like snow on Christmas night
and then in a twinkle I saw it no more
as it fell from the heaven's and then was no more.

what was it I wonder
this wonderous thing
but no matter my efforts
I cannot explain

was it an angle caught in my sight
or was it simply a reflection of light
I cannot say though I wish I knew
what the thing really was
but I've seen no more no longer in view
I had not the time to think it through
 but still I do wonder what might it have been
or if I shall ever see it again.