Movies
Let me tell you a little story about a man named Sh! Sh! even before you start. That was a pre-emptive "sh!" Now, I have a whole bag of "sh!" with your name on it.
— Dr. Evil ‧ Austin Powers: International Man of Mystery

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker builds an elaborate joke around interrupting someone before they can speak, labeling every interruption a preemptive 'sh' and claiming to have a whole stockpile saved up. It's absurd wordplay that turns a simple shushing gesture into an exaggerated, cartoonish threat.
Context reviewed