What's a beer ball?
A large plastic ball of beer.
Had a small tap with an air pump on it to get the ball pressurized so the beer would come out the tap.
They sold them 20-30 years back.
Not sure you can buy them anymore.
Here's a link - ball is inside the box.
http://www.collegehumor.com/post/202138/this-is-so-funnyHere's a photo of the ball -
We used to use empty ones to make great backyard lights.
A cord and light socket with a 60 watt bulb inside worked well.