talk to them and help them through their problems. ive been there and my friends helped me through it, sometimes it may not have helped, but it feels better knowing you not alone and theres someone there for you.
Answer: I think that the best thing you can do is be there. This might not be the answer you are looking for, but I think that you should be as nice as possible. Make sure your friend has someone to talk with and the maybe even the availability of a counselor
Answer: The automatic response to tensing your muscles after you hear the sound of the clanking the rollercoaster makes is an example of the phrase pavlov's dogs, which can refer to classical conditioning because it refers to the habit of automatic response to a stimulus.