Justifiable Homicide?
From an online news article:

A Ghanaian man stabbed his wife to death after she cut off his penis with a breadknife, police in the central German city of Kessel said...Police said surgeons sewed the severed organ back on after the man was detained and taken to hospital.

I'd take the temporary insantiy defense myself, but that's just me.

By the way: A breadknife? Seriously, dude, how drunk were you? Did she try to cut out your heart with a pencap first or something?

(read the article here and another one here)