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If you want to learn to ride a monocycle or do acrobatics at 75, it’s probably not a good idea.

"Sometimes you find yourself on a tightrope riding a monocycle while juggling knives," he told Opera magazine in 2006 when he was about to leave Wales for Houston.

Sergeant Walpole got exhaustedly off his monocycle and duplicated the 'copter man's efforts.

And then the treads lifted, and he saw the monstrous gas-spreading tubes at the stern, and the exhaust-pipes into which he could have ridden, monocycle and all.

He flung a leg over the monocycle's seat and pointed tiredly to the trail of the Wabbly.