L: Library books

When you're writing your thesis/dissertation, you have about 500 of them sitting on your shelves, your floor, in your bathtub, on your dresser, and probably in your mailbox (basically, wherever they'll fit). The people at the circulation desk know you by name and they groan when they see you coming, since you'll probably be bringing them yet another ancient, musty book that you found aaalllllllll the way in the back on the ninth floor that no one's checked out for at least a hundred years. Because of that, the book won't have one of those nifty, modern barcode stickers on it, so the dude will have to hunt up some barcode stickers, enter all this info into the computer, and half an hour later, with twenty people in line behind you by now, you're free to go.