The last person to forget is you
Are you ever haunted by old memories? Something that happened a long time ago that you are embarrassed about?
We worry about these things because we think other people still remember them too. But they probably don't. You are the last person to forget. It sticks around in your mind because there is an emotional connection (in this case, embarrassment) and because you have an anxious brain. Not because everyone else is still laughing at you.