This is from Some Poems About Life, available on this website.
My Mistake
I never make mistakes,
I’m quite meticulous.
I pride myself on veracity
and never make a fuss.
Of course I might make a gaffe,
a misstep I might take,
or even an inaccuracy,
but never a mistake.
I’ve been known to make an error,
or a false move I could fake,
or possibly a blunder
but never a mistake.
I once did miss a misprint,
and a blooper for goodness sake.
And my tongue’s been known to slip a bit
but never a mistake.
No, I never make mistakes,
for granted that is taken.
I actually thought I’d made one once,
but I was mistaken.