Okay, I'm sure this will work....

[FedoraDave]

...but I don't want any oil or grease in my beer. How about learning how to properly pour/draw a beer?

http://mentalfloss.com/article/89781/ge ... asy-finger

[BlackDuck]

Yup...that was an old college days fix to a young bartender who didn't know how to pour a beer from the tap. Or was pouring as fast as possible to keep up with the large crowd of young whippersnappers who were there getting drunk and trolling for the best opportunity to take a girl home.