The cake is not a lie. Well, at least it doesn't seem to be according to Valve Corporation's Portal  (Xbox 360, PS3, PC) holiday greeting video. Ok, we've been fooled before, but the video seems like a pretty nice gesture from the Aperture Science research corporation.

If you haven't played Half-Life 2 (Xbox 360, PS3, PC), you might want to know what the Aperture Science research corporation is. This fictional company from the Half-Life universe was tapped by the U.S. Government to conduct research on Portal technology. a phenomenon aptly described as a "man-sized ad-hoc quantum tunnel through physical space with possible applications as a shower curtain"

By now, you may have realized that Portal is a game that doesn't take itself too seriously. That said, we're not going to keep you any longer from the video. Enjoy! Oh, by the way, the Weighted Companion Cube makes a nice cameo appearance in the vid. We doubt you'll miss it.