Every show has that thing that they do a lot, but you probably wouldn't notice unless you're binge-watching it. An example, since I just recently watched it, is Peter Bishop in Fringe having a sarcastic line in seemingly every episode in the first season about how his father is a quirky mad genius and how that annoys him greatly.
In Smallville it was always someone (generally Lana Lang when she was on the show) asking Clark "how can I trust you?!" Because...you know...secret identities.
Also: "You're the only ship in the sector!"
He says, doing the exact same shit without the slightest hint of self-awareness.