Opiates (morphine and codeine) can be detected in urine for at least 48 hours after one eats food containing poppy seeds. As little as a single bagel covered with poppy seeds could produce a false positive test for these drugs.
Pessimism would be the term. A pessimist often focuses on the most dangerous or bad outcomes in life, letting it cloud their happiness and judgement occasionally(being a mindset/lifestyle and all).
