Can be seen in many stressful situations in life. Most likely in smaller, more delicate bite sized portions but the principal change is still there.

A person has many faces and attitudes to many different types of situations. Perhaps we all have the same faces and the only difference is that we swap a few faces here and there. But regardless, a persons day to day or dominant face(s) is often how a person is typically seen. It is probably why if you see a person on a normal day, they will seem bland and whatnot. Yet, if you were to spontaneously enter a dramatic situation, you would understand a bit more as to how they think.

Of course, that's just my thoughts...