When people say something is impossible, they very rarely mean it. What they almost always mean is one or more of:
- they don't know how to do it
- they don't want to do it
- they think it will cost too much
- they think it will take more time than is available
- they don't want to talk about it
It's much more productive to say "It will cost 100 trillion dollars to add laser haircuts as a company benefit. That's a problem because it's greater than the GDP of every country on Earth." Or maybe say "I don't know how to design a laser haircut system that isn't lethal. I think you'll want a 100% survival rate." Those kinds of responses can lead to productive conversation. Why 100 trillion? Is there a part of the requirements driving up the cost? What if we're flexible on the survival rate?
No one knows everything. Just because you don't know how to rotate an infinitely long cylinder doesn't mean your coworkers don't. Avoiding "impossible" allows for the kind of collaboration that makes an intentionally small company like Expected Behavior do incredible things.
Please don't say "impossible" unless you're prepared to provide a detailed, cogent argument demonstrating that conclusion. That probably involves showing it violates one of the widely-believed-unbreakable physical constants of the universe. Instead, focus on communicating the specific blockers between you and the stated goal.