There once was a man
From Nantucket who kept all
His tops in buckets
Sorry, just getting warmed up.
Addendum: Though the line-by-line syllable counts are correct, this turns out to be terrible haiku form.
Some general guidelines I found: The first 2 lines should paint one idea or image, and the last line, the kicker, another. The juxtaposition of the 2 ideas or images should reveal an interesting but non-obvious connection. And rhymes should be avoided.
Japanese haiku strongly favors direct experiences and observations over interpretations, theories, and implications.