Handle me at my worst
I tend to think I’m a rather even-keeled guy. I rarely raise my voice, and generally don’t let my emotions get too high or too low. Measuring the “worst” in someone is often a good benchmark of what to expect from them. It’s also why I very much dislike the phrase “ if you can’t handle me at my worst, then you don’t deserve me at my best “, as I imagine the “worst” in folks like that is pretty rough.