Here's a new source (at least for me): Middle school bathroom graffiti
The lyrics of a children’s song satirizing Kim Il Sung, Kim Jong Il and Kim Jong Eun have been found in a classroom and the restroom at Osandeok Senior Middle School.”
The children’s song is a well-known one in South Korea called “Three Bears.”
The re-written lyrics of the song, NKIS claims, are as follows: “Three bears in a house, pocketing everything; grandpa bear, papa bear and baby bear. Grandpa Bear is fat, Papa Bear is fat, too, and Baby Bear is a doofus.”
Even though when singing the song the Kim family members are not named, a short glance reveals the song’s satirical nature, leading the authorities to reportedly treat it as a reactionary element and investigate its origin.
Make of this what you will.
UPDATE: here is another example of P'yôngyangology but done much more carefully and with a cautious warning in the conclusion:
I suggest we use this example both as an etude in the anecdote-based Pyongyangology, and as a warning of how easy it can be to derive far-reaching conclusions from questionable evidence. Do we need culture-specific expertise? Obviously, we do. Otherwise, we risk basing policy decisions on a hoax.
Kim Jong Un in Europe? Perhaps not.