"Wheatley and Mister Norton have pooled resources and come to the profound conclusion that this was nothing more than a False Positive.

For posterity's sake: in June 2014 Portal received an update on Steam. Norton and most other anti-virus programs immediately branded the new 'portal.exe' file as a Virus. For about two days thereafter, the Portal message forums at Steam were flooded with threads about the new virus. There was genuine confusion and worry; even after Norton announced it was a 'false positive.'
It was during those tense 48 hours that I photoshopped this masterpiece of artwork."