Oh, most wonderful of nights!

I was walking through a dark forest with alot of tall trees. I hear something following me, but i don't look back to see what it is and i run for it towards a creepy old bathroom. Once inside, i went down a set of metal stairs, and when i reached the bottom, a metallic panel got pulled open and i went through the hole. I ended up in a huge chamber covered in white panels. In the center of the room there was a regular handgun lying on the ground, and shooting with it somehow created portals. After messing around with said portals for a bit, i fell through a portal and somehow ended up in a dressing cubicle in a clothing store, and when i walked out of there, i was wearing a fancy dress, everyone started laughing at me and then i woke up...

...with a huge confusing headache...