My haggard "I'm tired, overworked, and just want to be quiet right now" look has, I've learned recently, been misinterpreted as a "get the heck away from me, I'm angry" look. I hadn't the slightest idea.
Although my chances of getting a permanent research position in Australia are very remote, [the system] gives me the freedom to perform the research that I want, even when projects are risky.