There's nothing like going to a rock show, staying out late, coming home... and realizing that your hair holds the remnants of the club's cigarette smoke. I used to live by the Empty Bottle in Chicago, and before the city instituted its smoke ban, going to a show meant that my hair would smell like a dozen ashtrays. Not fun.
But lo! Reader Fixe had a good suggestion in the beauty shortcuts thread. Before heading to bed, she slips a fabric softener sheet in her pillowcase. In the morning, her hair smells like Snuggle Bear, not like Joe Camel. Because San Francisco has a smoking ban in clubs and bars, I can't test her tip... but it's so easy that it's worth a try, don't you think?