What are YOUR key sentences?

When I post a new lesson on PhraseMix, I hope that you will study it and get the key sentence at the top of the lesson stuck in your head. I want to keep adding new phrases until there are thousands of them for you to learn from.

Unfortunately, it's going to take a long time for me to add thousands of phrases, one at a time. But I recently realized that each of you already have phrases that you remember. I thought it would be fun to share those.

So here's my question: What sentence or phrase that you've heard do you remember perfectly? When and where did you encounter it? Why was it so memorable?