How about a cross promotion with Valve Corporation for Portal 2 and have Ellen McLain do a set of GLaDOS lines for Avast? In the same theme, since Gearbox bought the IP for Duke Nukem from 3D Realms and will *gasp* actually, truly for real release Duke Nukem Forever, (the first playable demos ever of DNF were at PAX 2010) a set of Duke Nukem lines would have ol Duke saying "I'm here to kick virus and chew gum, and I'm all out of gum!".