An outside advertisement display in Finland was defaced recently with a certain well known image from early internet: (warning article includes blurred version of the image)
> – It was clear what had been done. The media player's cord had been ripped out and its own content had been played.
To me, it's more an act of vandalism than hacking.
In addition to computers, other common obsessions were lockpicking (mechanical computing), model railroads (electricity + switches + relays), and Chinese food menus (language skills).