Scientific research around the world conducted by governments, health agencies and universities has, over decades, been unable to demonstrate any causal relationship between alcohol beverage advertising and alcohol consumption. It has, however, demonstrated that effective alcohol campaigns can increase both a producer's market share and also brand loyalty. One of the most popular forms of beer advertising is the beer sign. Many painted a fun picture of beer lovers enjoying their drink, other had a more artistic approach. While many were also nothing more than a funny caption. Below are some famous advertisements for several brands of beer.