As usual, the four of us were leaning against the window sill, while the rest were spread out across the general near vicinity - sitting on tables, leaning against shelves, borrowing chairs from nearby desks.
It didn't take many seconds - we certainly didn't have time to start talking - before a voice from somewhere to the left of us piped up: "Look, they're all wearing black".
A hush fell as all eyes turned against us. "And none of them are wearing glasses!" someone added.
It really doesn't take much for people to notice a pattern, does it?