firefly moment
n.— «Guests of the Women’s Resource Center enjoyed Embracing Firefly Moments at the Plantation Golf and Country Club with author/speaker Barbara Braunstein. Barbara kept the attendees in stitches with humorous anecdotes and lessons on how to watch for those brief-but-special moments in life that she likes to call “firefly moments.” Among her books: “Help: I Have It All, But I Have No Life’”Make Up Your Mind, Not Down” and “Firefly Moments.”» —“Guests savoring special moments” Sarasota Herald-Tribune (Florida) Dec. 3, 2008. (source: Double-Tongued Dictionary)
Further reading
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In geek circles, that term is easily mistaken for this:
http://www.mutantreviewers.com/r10firefly.html