A joke about mom and dad's blindness.

One day, Xiaoming and his father went out. When he saw a telephone pole, Xiao Ming asked his father what it was. Dad said it was sausage. When he saw a policeman, Xiao Ming asked his father what it was. Dad said it was a rooster. Seeing an aunt riding an electric car, Xiao Ming asked his father what it was. Seeing blood, Xiao Ming asked his father what it was. Dad said it was spit, and Xiao Ming dialed 165438.