Expiration Date is a movie made by Valve (or the teamfortress channel.)
The description reads "Engineer and Medic make an unsettling new discovery while experimenting with the teleporter . Meanwhile, Scout stops insulting Spy long enough to ask him an embarrassing favor; the Administrator's clerical assistant/cleaner/murder expert Miss Pauling races to bury some incriminating bodies; and Soldier makes a new metal friend."
It is the longest TF movie made so far, clocking in at 15 minutes.
Expiration Date