Jerking off
Brilliant jerks, they say, are toxic. Toxic in that they alienate the other employees, cause impediment to a wholesome and healthy working environment, and just generally drag everyone down. But like all things sometimes, a little toxicity can be tolerated (for a time) if the brilliance outweighs the downsides. The problem with brilliant jerks is that they rarely reveal their true selves during the honey moon period of working together.