I use that one all the time. Usually flies right over my students head.
I'm a big fan of, "If it's not one thing, it's your mother." But that stems from the constant 'your-mom'-ing that my now-deceased best friend and I would do. When we were roommates in college, we literally passed three hours of boredom in the dorm room by 'having a conversation,' that consisted of saying "Your mom" to each other in different inflections and tones of voice. ^_^