8. Baha Men, 'Who Let The Dogs Out?'
This didn't actually come out until the summer of 2000, but if Bill Clinton was president and no one had ever heard of a hanging chad, we're still counting it as the 1990s. "Who Let The Dogs Out?" was also originally recorded by Anslem Douglas in 1998. Two years later it was covered by Bahamiam band the Baha Men, and the song quickly became a worldwide hit. The Seattle Mariners began playing it in the summer of 2000, and countless stadiums across the world have continued to practice to it. In January of 2008, presidential candidate Mitt Romney broke into a spontaneous rendition of the song at a Martin Luther King Day parade in Florida. It remains one of the funniest things on YouTube.