I guess...

...it's exam week! We have a room with lockers and at the moment not a lot of them are empty. You have to be very lucky. At the time the pic was taken, I guess there were like 3-5 lockers left unused. This always happens when it is exam week or there is a date were eveybody has to hand in a term paper. The week before that, it's always crowed even if it's semester holidays!!