My biggest wife peeve happens when we are on the road. When I drive she feels out of control and is on edge. She hates the interstate and always thinks it is the day we die when we get on it.
Anyhow she will be quiet and suddenly does the, 'Oh My God!' or she shrieks in terror. It scares the crap out of me everytime because I think she sees an oncoming wreck that I am not aware of. There is never any near misses but it raises my blood pressure and makes me very tense for the rest of the trip.