You Are the Bomb
Baron Geddon is the meme boss of the Molten Core. His ability to turn player characters into a living bomb has caused many wipes or at least visits to the spirit healer.
The mechanic is fundamentally simple to play. The raid huddles at Position A, the raid leader defines Position B with a low ceiling and sufficient distance from Position A. Whoever becomes the bomb runs from A to B, waits there for the explosion (smacks their head against the ceiling but survives) and returns.
The problem: In the heat of battle, players do not always pay attention to their debuffs (or alarm messages from installed addons) and therefore do not realize (in time) that they are the bomb. Or they do not run exactly to B, causing the bomb to affect several allies.
Another danger with Baron Geddon: Half the raid often consists of DPS-hungry warriors and rogues who only focus on their statistics. I have seen countless times how one or the other has either run too early to Geddon or too late away from Geddon, dying in the regularly appearing waves of flames. And all just to maximize their so-called uptime and deal a few extra points of damage.