 Apparently, intense emotions and adrenaline makes it harder for your brain to store memories. It's why, for example, some people look at their wedding photos and are like, I smeared cake on your face. Why would I do that? They're just so overwhelmed with the Taylor Swift of it all that they just freak out. There's such a huge freak out that their brain just cannot, it doesn't have enough processing power, if you will, to store the memories. And so when it's all over, it's just a blur and they can't remember anything that happened.