A professor cancelled his class after realizing that many students were pretending to be sick on the day of April 19 - and he knew that it was to skip class and play Portal 2. He's not fooled by those students; just do a Google search quickly for April 19, and you'll easily see that's basically anyone cared about on that date.
http://www.tecca.com/news/2011/04/19/professor-cancels-class-for-portal-2/
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