Last night on GTTV, the world premiere trailer for Portal 2: Perpeptual Testing Initiative DLC emerged. The typically funny Valve trailer explains the new DLC, a free pack where players can create and share their own made test chambers. It looks great and as we reported yesterday, it will hit Steam on May 8th. Also, see if you see what we see at the 1:14 mark of the video. You may just sh*t yourselves.