The last panel is pretty crowded visually for what should be a simple punchline. I'm still not sure if either sign needs to be there, hence the washed-out colours. Trying to do any sort of visual arrangement makes me appreciate Spy vs. Spy, which, although it takes me several readings to "get", still has a joke that works flawlessly and "punchily".
Sometimes sub-jokes occur to me as I'm drawing the comic. I originally had a longer set-up with two pick-ups lines, but I found it inordinately amusing that Pilates would have ONLY ONE punchline but still number it.