Idioms Have Purposes Too! (Part 1)

Sometimes our idioms allow us to avoid directly answering a question or we respond in a way so clever everyone will invariably nod and agree.

Amy: Hi Beth, how are you doing?
Beth: As good as a pig in slop. (Or if you want to truly throw a wrench in the situation: As slow as a snail on salt.)))
Amy: So, you're ready for the test on Friday?
Beth: As long as the sun keeps shining and the creek don't rise.
Um, okay. But questions:
1. What if the pig is OCD? Is slop still a good thing? (And snails are always slow, but isn't salt fatal?)
2. Does the sun have to shine 24/7 or just for a few minutes? And do you have to see it...or is knowledge of it enough?
3. What if the creek just barely touches the bridge? And which creek are we talking about again? Because creeks in the desert only rise during monsoon season.