I once did an even more extreme version of this. I showed up with a contract for a new job that would give me a 30% raise and an opportunity to work from home as much as I want. I told my boss to match that offer or I would sign it.
He took a few days to decide and made me an offer that was significantly worse, so now I have a new job, more money and haven’t seen the inside of a corporate office in months. My old team has been completely dissolved because the old crew left faster than they could train replacements.








As someone living outside the US, your whole comment and the surrounding ones are absolutely wild.
Here in Germany, work without a contract is absolutely unthinkable. If anyone offered me a job without a contract, I would have to immediately report them to the authorities on the suspicion of tax fraud.
Also, even without a single word about it in my contract, they would have needed to notify me way in advance if they wanted to let me go. The exact duration varies by how long you’ve been there but the minimum is four weeks. For me it would have been four months because I had been there for over ten years. Also, the requirement for an employee to quit can never be stricter than for them to be fired. If you’re interested in the details, I recommend you find a translation of § 622 BGB.
And yes, these rules do get enforced reliably. The mere mention of the word “lawyer” usually gets even the most stubborn boss to comply in these cases because they know that every judge would rule against them within minutes.