"Don't you mess with ma' cigarettes woman!"
Reasons I've heard for domestic disturbances I've answered:
Used rent money to buy drugs.
Used drug money to pay rent.
Caught him with ex-wife.
Caught him with ex-girlfriend.
Caught him with current wife or girlfriend.
Caught him with current wife and girlfriend.
After double date at the bar, her boyfriend made out with other guy's girlfriend in back seat of car on the way home.
And that's just for starters.