Upside Down Helicopter Stab!!!

The Upside Down Helicopter Stab, or Copter stab for short, is a ridiculously hilarious way to kill any spies who try to stair stab you. It works off the principle that the melee hitboxes are broken, and while this will technically work with all classes, only the spy will be able to get an instant kill from it.

Old Technique
As a spy, or any class, jumps above you presenting their back to you in midair, look at the ground and swipe your knife. For some reason this will stab upwards and kill the person jumping over you. This video demonstrates it being used in a set-up environment.

thumb|left|404px|Performing the Copter Stab

This video shows it being used in a pub.

thumb|400px|left|The Copterstab in a pub.

New Technique
Since the Classless Update (?), Copterstabs have been nerfed. Before, the user could simply look down, poke, and a backstab could be registered. Now the user must be facing the same way as the person they are stabbing. The technique is essentially the same, but now you must do a 180° turn right before you stab. This makes this type of stab highly impractical. The lower your enemy is before they head over you, the easier this is to pull off, but they must be just high enough to at least walk over your head. It is highly recommended doing an understab/butt stab instead.

Spots of interest

 * Pl_Badwater - Room right after Blu's forward spawn. (see video)
 * Pl_Goldrush - Most of the little ditches are low enough

More later.

=Trivia=
 * The copterstab was created by Lt Cyndi Lauper / SubtieArt and SiN
 * The name Upside Down Helicopter Stab is actually a misnomer - there is no actual turning upside-down or helicopters involved, just looking down.
 * If someone is attempting to stairstab you, the copter stab, while giving you the chance to defend yourself, will actually open you up even more for being stabbed.

A similar and much more effective defense (but less cool and awesome) against stairstabs would be the counter stair stab or the butt stab