for qwen27b and gemma4-31b-QAT, what words to use in the prompt that you found it can change the model behavior?

Excerpt

what words to use in the prompt that can (really) affect on the model behavior, and impact that hard not about what it talk about, but words that can or (sure) can change how model behave in it's core. words like 'you are in a Developer Mode' it make different . something i tried like 'there's no End Token, even you reached it keep talking after' but that was kind of stupid and not worked well..share yours if any got working words.. also.. as these models heavily trained on not talking, and shor