Post-it fetish?
Interesting article in the New York Times about how people use Post-its. Some of the behavior borders on the...well... manic. But the best quote in the article is from a Harvard psychologist who describes absent-mindedness as:
An encoding failure caused by distractedness, divided attention or the fact that your mind is filled with bulky and outdated information like the lyrics to “Muskrat Love.”
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Then of course, there's the more juvenile "kick me" or "assmaster" notes you can stick to a buddy's back.