Before I encountered the Internet, I occasionally used the phrase "to toe the line" to mean "to conform," and never thought anything about it.
Once I entered the world of Usenet, back in the Middle Ages (I wish I could lay claim to having been there during the Dark Ages), I started questioning myself, because I occasionally saw the phrase spelled "to tow the line." Which is it? Both sort of make sense: to line up with many others behind a mark, or to take one’s part in dragging the burden behind you.
A little Google work convinced me I was right before. "toe the line"
Searching for "tow the line," however, turns up nearly a third as many references. It’s an up-and-coming eggcorn!
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