Claustrophobic, what’s the scariest moment you’ve had with small spaces?

So I was having a good time with my friends. A pile of single mattresses was under some stairs where we were staying. We’d put someone in these and then jump on top of them. Being under a staircase made this a small space. Plus, I was the one who was sandwiched between mattresses. I was having a good time until something went wrong in my head and I panicked. I felt so confined in there! Anyway, I got out and everything was fine.