1. Purchase a candy jar.
2. Fill it with candy.
3. Bring it to your place of employment.
4. Wait for the sin natures to show up (this should only take a couple days, at the most).
Nothing brings out the sin nature like the candy jar. You will see it manifest itself (both in you and your coworkers) in the following ways: greed, selfishness, deceit, judgmentalism, frustration, impatience, discontentment, unthankfulness, lack of self-control--to name a few.
People are basically good. Huh! I say. Bring out the candy jar, and we'll see. (Present company included).