If I were a clothing store salesperson, I’d wait until a customer came in and asked me a question, like “Can I try these on?”
I’d say, “No.”
The customer would likely respond with “Ummm… are you sure?”
I would then say “No. No. Nononononononono!” and I’d start to dance around them, waving my hands in the air and twirling about, singing merrily, “No, no, no-no-no! No no no, no no no, No no no-no no-no-no, no no no, no no no!” I would continue to dance and sing the No Song until they left.
If that didn’t get me shitcanned, I would await the next customer and the walk up to them and start acting like an angry parrot, bobbing up and down and pacing about them, preening my hair and spreading my arms to try to look bigger, making weird faces and screeching until they left. That should do it.
If I wanted to quit my job as a minister, I’d start trying to convert people to random beliefs. I’d probably even use Rev. Lovejoy’s line: “Have you thought of joining one of the other major religions? They’re pretty much all the same.”
Either that or I’d just start making up vows for the wedding ceremonies.
If I was the foreman of a traffic light manufacturing plant, I’d start slowing down on the job for a week, and then just stop coming to work altogether.
As a soccer goalie during the World Championships finals:
“You´re all stupid! I´m taking my ball and going home!”
As a simultaneous interpreter at the UN:
Misinterpret the speaker, preferrably telling an embarrassing story in such a convincing way that the delegates think he´s actually saying it. If that fails, start singing. Or reciting nursery rhymes.