Boss insisted that I lie to a customer. Not being a salesman or lawyer, this was not something that I normally did.

The customer was a 911 Center in WA and my company was contracted to put in a new computer aided dispatch system.

My boss wanted me (the project technical lead) to tell the customer that we were on schedule for the contracted installation date. We had not even started working on the system yet because were had been swamped by change orders for another WA 911 facility. I knew for a fact that we were were going to slip at least four months. The boss was planning to falsely blame equipment delivery delays (due to a terrorist attack on a Motorola facility in Israel) for the delay, but needed to wait longer to justify the claim. The potential performance penalties ran in to the high six figures.

I told him that the company medical plan prohibited lying to customers wearing sidearms.

I received the ultimatum of "if you value your job then tell the customer that we are on schedule". I went back to my office, packed up my personal stuff, said goodbye to a couple of co-workers, stopped by the boss' office and intentionally burnt my bridges. I joined a start-up, with other former employees, the next day. Never regretted it.