Find the Invisible Cow is like a web version of Marco Polo. This is a LOUD game. You can adjust your volume, but to find the invisible cow, you have to hear the shouting. Sure, I found the cow, but the first time I did this I bothered everyone in the house before I realized I was supposed to click on the invisible cow to end the game. I hope you will take that instruction to heart. -via Metafilter
Or you could just move the mouse around till it changes.
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