What would be a harmful side effect of cold medicine?
a. you have chills throughout the night
b. your nagging cough goes away
c. your runny nose has dried up
d. you break out in itchy hives

A harmful side effect would be breaking out in hives. Yes, having chills is detrimental to your sleep, but not dangerous. Hives are a sign of anaphylactic shock, something that can kill. If you break out in hives from a medication, you should call an Urgent Care. If you get hives and labored breathing you should call an emergency room. 

I remember the time when Zinedine Zidane, the well-known french soccer player, who is one of the most successful and skilled players in soccer history,   attacked the Italian player Materazzi, that event cost the cup to Zidane, because it was during a Worlds Cup. According to some sources, Materazzi insulted Zidane, which triggered his behaviour.

Other opinions say that due to the level of competition, the event, the pressure and intensity of the game, all those factor influenced Zidane to act like that, which was a poor sport behaviour.

I really believe that the context was the main factor that pushed Zidane to act like that, because it was a Wold Cup, the most important tournament in soccer.