Summarize the following:
Check the switch on the ball valve and look for the “on” and “off” labels. Make sure the switch is in the “off” position. Use a clean cloth to wipe the inside and outside of the mouthpiece.  It’s always a good idea to clean off the mouthpiece of a beer bong before you use it, especially if someone else used it before you. If the switch isn’t labeled, test the beer bong by pouring a little bit of water into the funnel end. If the water flows through the valve, flip the switch so it’s off and pour out the water. Hold the funnel at a slight angle and slowly pour in the beverage so the foam doesn’t build up in the tubing. Continue pouring until the tube is full and the liquid is in the funnel. Try not to overfill the funnel and have the liquid right at the edge or you could spill it.  A foamy liquid is sure to make your stomach hurt and could make you nauseated when you consume it. A little bit of foam is normal, wait a few moments until the foam subsides before you drink it. Hold the funnel up over your head when you’re ready to use it. Elevating the funnel will allow the liquid to flow right through the tube and valve.  A beer bong uses gravity to help the liquid flow. Try to hold the funnel in a fixed position so the liquid doesn’t slosh around. Place your lips around the small mouthpiece tubing so it’s you create a seal with your mouth. Don’t allow space between your lips and the tube or it could cause air to mix with the liquid as it enters your mouth. Mixing air into the liquid could build up pressure in your stomach, which could be painful or make you nauseated. Take a deep breath and open the valve to start the flow of liquid. Relax your throat to allow gravity to force the liquid directly into your stomach.  When the beer bong is empty, close the valve and pull the mouthpiece out of your mouth. Consider high-fiving your friends around you to celebrate your victory!

Summary:
Wipe off the mouthpiece and make sure the ball valve is shut off. Pour a beverage into the funnel slowly. Raise the funnel overhead to allow it to flow. Put your mouth on the mouthpiece. Open the valve on the ball valve to release the beverage.