When you mentioned your co-worker you reminded me of Raymond Reddington from The Blacklist. He could remember so many details from everyone and everything. I know it's only a show, but it's amazing to keep all those pieces of info in your head.
Anyway, it's great that you inspire us to look for our thing. Sometimes we won't even know about our superpower until someone tells us so (like your co-worker telling you about your joke skill). And we should all try to find something no matter how big or small it is. There has to be something that makes us unique!
Thanks for sharing.