> Something about how anger makes a deeper mark in your memory than joy does.

Uh? I thought that for most people, bad memories fade away and only good ones remain. And that's what I observed around me as well (I noted it because I seemed to be the only one in the group to remember bad memories linked to a certain period, while other guys only remembered the good ones and looked at this time through rose-tainted glasses and had totally forgotten about the whole lot of hardships we went through).