One Heavy you won't of heard about however is Hefty - this is because most who see Hefty are driven insane or break into uncontrollable anger, often resulting in them being taken into care or disappearing without a trace.
Due to this the stories of Hefty are often found in the form of screenshots, text files or the occasional garbled message on a mobile - common themes are "Hefty is coming" and "Hefty doesn't like you".
Dismissed as a hoax by authorities these bits and pieces slowly piece together a disturbing phenomena, one in which people are transported into a seemingly empty Team Fortress zone with the graphics badly distorted, the colors often reported to be inverted.
Trying to exit the zone is impossible and a feeling of dread overwhelms them, they experience a sensation of footsteps in the real-world and often grow more paranoid - telling of fears that someone had broken into their home, the game refusing to turn off.
The zone then plays horrible sounds akin to men and women weeping in despair, at this point many of the messages become garbled - as the victims seem to lose all sense of reality and can no longer fully function.
It is then Hefty appears, a close-up image of a Heavy, staring at the screen and inverted like the rest of the zone - at this point the messages end completely. The victims are often found by friends or family, at which point authorities are called... though some stories say a victim's family has entered a room, hearing cries of horror, only to find them completely gone...