3 years ago, the hotel that ACen was at was under construction and there wasn't room for a green room. So the cosplayers had to wait outside in a tent-covered pavilion. It was 50 degrees out, and we were all so cold that some people grabbed tablecloths off of the few tables that were there and used them as shawls and blankets.
Eventually, the hotel let us wait inside, along a hallway. But the hotel staff were really strict about staying in line and not making a ruckus, and not even taking pictures. In silent protest, my friend began singing Bohemian Rhapsody. We started singing along, and before you knew it the entire line was singing at the top of our lungs. I don't think the hotel staff were amused, but I sure know we were!