Limerick 5

Mine, for a change:
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From Kanpur there came a lad,
Wanting to mount the Nevis real bad.
Ah, but 'twas a mighty steep push.
Made dangerous by banana skins,
Lurking slimily behind every bush.
So, to save his expanding ass,
He partook of beans,
And floated up purely on gas.
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This way to Limerick 4.