Please Tune Before The Show Starts

When you are a performing musician, you see things in a different light.
Or maybe I should say you hear things through a different effects processor.
Take, for example, this warning on a corrugated cardboard carton.
A "normal" person understands it to mean "leave the boxcutter in the toolbox."
But my brain automatically inserts certain [understood] words:

DO NO OPEN [THE PERFORMANCE] WITH SHARP [OR OTHERWISE OUT-OF-TUNE] INSTRUMENT

~ FURTHER READING ~

The Elmwood Court Jazz Band has been known to play a tune
with members of the rhythm section switched to wind instruments.
The drummer for the seven-piece combo then becomes the "maestro."
He introduces them as the "Elmwood Court Wind Ensemble"
and makes this comment:

"Wind Symphonies always start their performances with a short,
very dissonent piece that's not even listed on the program."

The group then proceeds with their individual warming up & tuning.