What was the most game breaking bug?

The same 2014's bread glitch that could capture the last Payload's point, trigger the explosion and make the cart invisible. Here's the video for it.

In 2015, after the Gun Mettle update, weapons became physics objects (previously just weapons), and were no longer used as ammo nor metal (for Engineers); a medium ammo pack would fall instead. Seeing that weapons fall depending of where they were located by the movement, I remembered a glitch I spotted with in Source FilmMaker, where attached weapons to the player would go under its feet if taunting with certain taunts (be checking my Steam profile as I'll soon upload an example (gif image) of what I'm talking about), so I decided to test it in-game and it worked: the new weapon system and/or the ammo pack triggered the trigger that is inside the hole, capturing the last point, triggering the explosion, and making the Payload cart invisible but movable, but the game would still not end until the time was out or BLU captured the pre-last point (so it makes all the points captured and wins the game). This glitch was fixed in less than 24 hours after NISLT published the video. 2 days later, I tested another way to perform the glitch, where taunting and picking up your dropped weapon would replace your current one and fall under your feet again, triggering the trigger. This one was fixed early after NISLT published a new video of it. A few days later, someone found a new way to trigger the hole's trigger by dropping weapons on the glass platform until it rotates a bit and falls through it (I would never imagine it can happen). It was probably a glitch related to the weapon's hitbox or something, so it could penetrate through the glass (originally a moving prop). It seems that this one was hard to fix or couldn't be fixed at all, so Valve decided to fix every Payload map where the entity that filters objects (so only the cart can trigger the hole's trigger and no other objects) was missing or not set properly, alongside the new pl_Borneo map. It took them a week to fix them all, but still, players got bored of the third method 3-4 days after NISLT's new upload.

/r/tf2 Thread Parent