the guy/girl(you) joyfully opened the door and a smile shone on his/her face, but after only a moment it went out along with the guy's mood ... he/she saw such a picture:the whole class crowded around his/her desk and took pictures of something, while one dark-haired man snickered maliciously and sat in his seat, fingering every now and then, sparks shone in his dark eyes..

— what happened..?