Humorous:
* A tank built by a chap named Mac,
* Had wheels that spun and a flame-thrower attack.
* The army said "Wow!"
* Then they said, "How?"
* And Mac said, "It's all in the track!"
Serious:
* A visionary, with blueprints and steel,
* Conceived a new weapon, a force to reveal.
* A tank, swift and strong,
* To right every wrong,
* And change how the world's wars would kneel.
Rhyming with "tank":
* A genius, with blueprints, quite frank,
* Designed a new tank, a mechanical plank.
* It moved with a thunk,
* And its cannon would clunk,
* A marvel that made history spank!
To complete the limerick, you'll need to fill in the rest of the poem with the inventor's name and details about their invention. Good luck!