I found this great website (foundmagazine.com) where people submit random notes and pictures they find. It's fascinating. Take this to-do list for example:

To Do:
turn in library books
find out about college
mail Dads shit
pay bills in advance
hide guns
pack
get medication
do taxes
sew PC up
change adresses
pay Columbia bill

That's quite the itinerary. Anyway, check out the site.