I have bloggated in the past about the amazing habit people have of drawing on library books. I won't say this takes the cake, but it certainly has the slice with a lot of icing and one of those sugary candle holding things:
There is a most interesting idiot at work here, drawing a stereotype Japanese cartoon girl onto an image of 'Part of a lineal city at Madrid' on p. 11 of C B Purdom's The Building of Satellite Towns (1925 republished 1949). The artist has used the suburb of Canillejas as the girl's chin. Is it kind of 'I've read ten pages of this book... time for a break... ooh, hello baby!'? Don't know, will never know. Theories?