"I forget"...a story about my amazing memory

One morning I woke up with a pain in my left hip/but. I decided that I would investigate and found an enormous bruise, by enormous I mean at least 8in. in diameter. It was puffy, dark and very tender. As I puzzled over how I could have gotten such a large bruise I decided to call my sister. I was joking with her about how I hurt myself all the time and am always finding mystery bruises. I said "I mean I could probably fall down the stairs and forget all about (eyes widening at sudden realization)......I fell down the stairs and I totally forgot about it, that's how I got this bruise!" My memory is amazing.