"MOTHER PHEASANT PLUCKER"

"I'm a mother pheasant plucker.
I pluck mother pheasants.
I'm the most pleasant mother pheasant plucker to ever pluck a mother pheasant.

"I'm not the pheasant plucker.
I'm the pheasant plucker's mate.
I'm only plucking mother pheasants cause the pheasant plucker's late.

"I'm not the pheasant plucker.
I'm the pheasant plucker's wife.
I've been plucking mother pheasants my whole pheasant plucking life!"

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UPDATE: Found and extra verse!!
"I'm not the pheasant plucker,
I'm the pheasant plucker's son.
I'm only plucking pheasants 'til the pheasant plucker comes."

And try this other 'dangerous' tongue twister!!
"I'm not the fig plucker,
Nor the fig pluckers' son,
But I'll pluck figs 'til the fig plucker comes."