I've found your new favorite website: Funswitcher.com. It has pretty much every sound known to mankind. From TV show theme songs like Community and Buffy, to video games sounds like Super Mario Star. Hell it even has sounds for having an orgasm and your favorite memes. You will lose hours to this website and you will not regret it. [Fun Switcher via The Awesomer]
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Doesn't seem to work in Chrome, works fine in IE. However, any site that has a banner ad promoting an app that tells you when you've been unfriended on FB makes me a bit wary at the legitimacy of the site.