TIck Tock
They recently aired a show where they talked about Frank being nicknamed "Tick Tock" when he was in high school because he was heavily into collecting clocks. And to demonstrate it, he bought a grandfather's clock from some family.
Now I admit I haven't seen every show, and I admit I don't always watch them that closely when they're on. But I've seen a lot of episodes where there have been clocks and I've never seen Frank pay much attention to them. Why is this coming up so late in the series? And why doesn't Frank buy more clocks? Maybe he's burned out on them?