About 20 years ago, my cousin had a severe head injury from a fall. He was about 20 at the time and was in a coma for almost four weeks. When he woke up, he fairly quickly discovered that his memory was eidetic. He could repeat entire conversations back word for word and even tell you the date and time you said something.
Also, he could memorize images with just a few seconds glance. His memory is still eidetic today. It’s annoying as f#$k. Whenever he reminds me of something I said in the past, usually something I can’t even remember, I suggest that we hit him in the head again.
On a brighter note, my ex-wife at the time stood beside me the whole time and no we are back together and closer than we ever were.