a jug with water, glued to the table

There is a jug with water, glued to the table. Players cannot move it but they have to move the water to the other side of the room using nothing but a straw. The solution is to dip the straw into the water, close the upper opening with a thumb and move the water that way. If you are afraid players will use their mouths to do that, use something that tastes bad instead of water.