Being asked (or more accurately made!) to travel Mon-Fri (i.e. staying away from home) for at least 2 months to a customer's site to work on a completely insane project that had no design, formal requirements, preparation or support. It was just a "friendly side project" 2 friendly managers concocted.

After some research, the project wasn't actually technically possible, but the customer wanted it so I had to try to find a solution.

The complication for me was that my wife was almost 8 months pregnant with our first kid and I made it clear I really wanted to be at home. Was left to feel I had little choice but to go. Project runs over but damnit I'm taking my 3 weeks parental leave entitlement.

Day before I'm due to go back to work, I get an email saying "You'll be travelling tomorrow for the next few weeks". At that point, I replied with the most angry work email I've ever sent and threatened that if that was the case I wouldn't be back. Plans were changed.

I ended up leaving within a couple of months anyway.