I have sort of been doing my best guess on the difficulty. I have all the episodes memorized, just like you, and I have no idea how hard it might be for the average fan.
I think medium is right. It's an unusual enough scene to narrow it down, but being a callback to an earlier episode makes it more difficult (you can see in the comments how most people are associating it with I Dated a Robot rather than Love and Rocket).
On the DVD commentary they say she recorded a bunch of variations of this line when she was recording for "I dated a robot" because they wanted to make this call back, but weren't sure the full context