Little joke

Collective dieting to survive the end of the month. At the end of the month, when everyone is the poorest, no one in the dorm has any money, and no one dares to ask their family for help, they collectively go on a diet. To save energy, everyone skips class. At noon, the counselor comes to the dorm and is very surprised to see everyone lying on their beds weakly and listlessly. Before he can say anything, the dorm leader leisurely says, 'Lunchtime.' Everyone slowly gets up from their beds, goes to the water room to drink some tap water, and then comes back to continue sleeping...