This showed up on my school's toilets and I'm not even mad:
Roses are red,
Mr Smith knows you're wanking.
He's coming right now,
To give you a spanking.
There's a legit reason for that, i asked my Korean friend about this ages ago, so please correct me if I'm wrong but a longtime ago there was certain families that were high in power, two of which were the Kim's and the parks, (there's more but I can't recall sorry), besides those few families everyone else was seem as lower or commoner people and were treated worse. So in order to appear as though they were a part of this higher family and to be treated better a lot of people would change their last names to Kim or park or the others.
Roses are red,
Mr Smith knows you're wanking.
He's coming right now,
To give you a spanking.