A removable lid for a drinking cup is described. The removable lid has a top side with an ellipsoidal recession having a bottom opening. A baffle wall extends from the perimeter of the bottom opening, and is configured to prevent a beverage from passing through the bottom opening upon sudden movement of the beverage. The ellipsoidal recession may be designed so that a hot beverage being consumed through the removable lid is exposed to more outside air for cooling purposes. The same ellipsoidal recession may be designed to funnel added ingredients into a beverage. The removable lid may have a stirrer opening so that stirrers may be inserted and taken out without lid removal. For additional strength, the surface of the removable lid may be textured to increase its moment of inertia. The bottom opening of the removable lid may be closed using a fitted blocking plug.