Breath/breathe
Hardly anyone under the age of 35 seems to know that breath is what you breathe (i.e. breath is a noun, breathe is the verb).

You cannot struggle to breath.
( shinyshinyscalp less a man, more a way of life, Thu 31 Mar 2011, 16:50, 6 replies)

See also loose/lose
and "baited" as in "I waited with baited breathe."
( emvee cruor deo cruoris, Thu 31 Mar 2011, 16:52, closed)

Hurrah!
I am under 35! I know the difference! I am special!
(sabre-tooth monkey, Thu 31 Mar 2011, 17:01, closed)

no.

(waxdart hello., Thu 31 Mar 2011, 17:02, closed)

Yes.
Now run along and play with your whip & top, you young tyke.
( shinyshinyscalp less a man, more a way of life, Thu 31 Mar 2011, 17:28, closed)

I've never heard this used wrongly.

(waxdart hello., Thu 31 Mar 2011, 17:02, closed)

Neither have I
But I've seen it loads of times.

The two meanings sound different, see. One sounds like "breth" and the other sounds like "breeeeeeth". It's when they're written down that the trouble starts, because the ignorant fuckers don't know the two words are spelled differently.

Loose/Lose is even worse, because "loose" has a short vowel sound but is spelled with a diphthong, while "lose" has a long one but is spelled with a single vowel.
( shinyshinyscalp less a man, more a way of life, Thu 31 Mar 2011, 17:27, closed)