git commit -m "Increased technical debt"

git commit -m 'more bugs added'
git push --force

git rm -rf .
git add .
git commit -m "fixed all bugs"
git push --force

For extra flavor, start by checking out an orphan commit. In that case, expect an angry mob with pitchforks and torches.

(Any decent workflow is be robust against this, but in a shitty workflow and when no one knows how git works, this can become a bit messy.)

I have a rant somewhere about wearing a t-shirt with TDD in the front and Technical Dept Development in the back. It used to annoy the shit out of my team. Ah, good old times.