I won't use a quote to highlight Bert and Cloudstrife777's posts it'd only form a massive quote pyramid.

Anyhow, my eidetic memory is mostly auditory based. However remembering something auditory can trigger other memories related to that event. For example, my ex fiance and I met back in November 2004 when I was no longer a child by any means. On our very first meeting a friend of ours was sick because she got too drunk, another friend of ours almost had her handbag snatched which resulted in me fracturing my kneecap catching the guy. I never went hospital for it because of my deep hatred for the places. I eventually got it x-rayed at the insistence of my GP a few months later (when I eventually conceded that my bones weren't quite alright) remembering little things said then perfectly can trigger in my head actual visual memories where I can picture my ex-fiance down to the exact clothing she wore that day (it was a leopard print mini-skirt, torn fishnets, doc martin 18 hole boots, black top and a black jacket... I can actually tell you what colour her underwear was since I glimpsed the panties she had on that day, but I'm not going to) I can also remember pretty exceptionally well my first real date a week later with her. Considering it is now Feb 2012 it's been almost 8 full years. I am known to often think aloud to myself about things I want to remember because of how my memory works.

Essentially I can be one of the worst people you want to make a promise to because I will generally remember things like that and I hold people to their words.