I once made a joke magical realm too.
When I was GMing a game in which the party travelled through a realm where all the dreams of dreamers manifest themselves, I included the original piss forest and bridge troll from pic related. I made the players roll a knowledge planes check and told them that so called magical realms are common in the Dreamlands for they exist whenever somebody has a wet dream.
My players are all /tg/ veterans so they knew what was coming. Surprisingly, no one hit me.