Another cute submission was sent in by Arnstein Mustad:

I sailed on half a ship
on half the seven seas,
propelled by half a sail
that blew in half a breeze.
I climbed on half a mast
and sighted half a whale
that rose on half a mighty wave
and flourished half a tail.

Each day, with half a hook
and half a rod and reel,
I landed half a fish
that served as half a meal.
I ate off half a plate,
I drank from half a glass,
then mopped up half the starboard deck
and polished half the brass.

When half a year had passed,
as told by half a clock,
I entered half a port
and berthed at half a dock.
Since half my aunts were there
and half my uncles too,
I told them half this half-baked tale
that's half entirely true.

Jack Prelutsky, from A Pizza the Size of the Sun