Why do I have an update on the Mac App Store for an Angry Birds app when I have not downloaded the app?

I have a strange issue where the Mac App Store always shows an update available for an Angry Birds app I have never downloaded on my Mac. Everytime I click on it for update, it gives a strange Username for which the update is available.
     This is the username that comes up when I hit "Update"... I noticed this problem exists on my friends iMac too and it is the exact same email ID that shows on the screenshot above.
Please help.

Just to make sure, open Mac App Store and click Purchases. Can you pause the download and restart it?

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