The Brotherhood was fighting with the X-men again.
Then Storm accidentally zapped Pietro. When everybody saw him, they threw up, so his already gross remains were mixed with vomit.
Disgusting, huh? And that's not all. He was accidentally reincarnated as a pig about to die at an abattoir. The result: a bloody pig's brain, bloody pork and pig testicles, which were promptly force-fed to a very evil person (the most evil person you know of).