No, I don't mean his pole dancing cruise queen daughter got knocked up (I totally pulled out).
From Beer Advocate:
My grandpa used to put a little salt in his beer, but I never asked him why. Can you help? Thanks.
Shane
Columbus, OH
Putting salt in beer stems from a few philosophies - all of which seem to have had a purpose at one time or another. An old wives' tale said that putting a sprinkle of salt in your beer would stave off cramping during hard work. Dehydration can cause cramping of the muscles, because of the depletion of minerals in the body. Adding salt to the beer would make the worker thirsty, and thus he would drink more beer to relieve the dehydration.
Others add salt to beer for flavor purposes; post-prohibition (1933) beer had turned into somewhat of an ugly being. Breweries had to cut costs and started to use cheaper ingredients like rice and corn, which made for a nearly flavorless beer. These beers are still around, though most people have become accustomed to flavorless beer and so have no need for the salt. Many South and Central American beer drinkers will add salt, and sometimes hot sauce and/or lemon, for flavor, or to mask off flavor in beer.
The last reason we found, which also makes no sense, was to add salt to beer to knock the carbonation out. Why not just pour the beer out hard or swirl it a couple times?
Really and truly, there is no reason to add salt to your beer (unless you are 80-something and traditions die hard with you). Nowadays, adding salt to your beer is a complete oddity, something of the past. Save the salt for a good steak, and leave the beer alone!