Critical Thinking Examples

I teach part time in a PN program. One of the objectives is critical thinking. The students always ask for an example of critical thinking. Since starting my MSN program, I realize this is a loaded question, with it being difficult to define. Does anyone have good examples of critical thinking? Here is one from the discussion posts in my class that I thought was excellent (but PN students don't do art lines):

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I responded to an over head code in the ED while working in the ICU. In the assessment portion of the nursing process in relation to code; I noticed that while the physician was inserting the arterial line a nurse zeroed it before the Dr. was done connecting it. This really makes a difference in your wave formation. At this point the blood pressure on the monitor read 60/30. Another nurse hollered to me to "open up the Dopamine!" (Which was infusing) I had also noticed that the patient and he did not appear pale and had a palpable radial pulse. I responded to that nurse "No, I am not going to open up the Dopamine. That is not his real pressure". The Dr. responded "I know I'm in an artery". I explained that the art line needed to be zeroed as I walked over and zeroed it. The pt.'s BP then read 132/74.