So that's where they come from!

The man seated next to me my first time at Tomsed was composing a message by the hunt and peck method. He pressed one letter on the keyboard, searched for the next, pressed that one, and so on. It was his one-fingered technique that attracted my attention, but when my eye alighted- not entirely accidentally- on his text, I caught my breath. The man was composing a 419 letter. A real-live scam artist sitting next to me. The words were as expected: “transfer”, “dear friend”, “deposited into your account forthwith." So this was the origin of all that flotsam.

That's Teju Cole, who also has great photos on his site.