--at least it's the first one I remember writing. Yesterday I mentioned to someone that, having grown up in Missouri, one of the things I missed here in Colorado is fireflies. It occurred to me later that fireflies would be a good subject for a haiku:
Fireflies
flitting, flickering
in the darkness, delighting
enchanted children
I liked the idea of linking the words in the lines with alliteration, though the alliterating sound should be on stressed syllables, which it isn't in delighting in the second line.