After a long night with the guys, Bob comes home at 3 a.m., and walks into the room. He reaches for the light switch, until he hears a familiar voice saying nearby, "Hello Bob." It is his wife, Alice. Bob gets a good reprimand.
This is a trope most commonly found in Western Animation and sitcoms, where a married man is out later than usual and upon returning is suddenly surprised to see his wife, [...] [tvtropes.org]