Can't remember where I got this from now, but it shows that you can't rely on the spell-checker; I've just tried it here & it says "No misspellings found"
Eye halve a spelling chequer,
It came with my pea sea.
It plainly marques four my revue,
Miss steaks eye kin knot sea.
Eye strike a quay and type a word,
And weight four it two say.
Weather eye am wrong oar write,
It shows me strait a weigh.
As soon as a mist ache is maid,
It nose bee fore two long.
And eye can put the error rite,
It's rare lea ever wrong.
Eye halve put this poem threw it,
I am shore your pleased two no.
Its letter perfect awl the weigh,
My chequer tolled me sew.