I like doing memory challenges. If you showed me the flag of any of the 193 UN member states I can tell you the country. I can list every US President in order. I have memorised every capital city. I also used to know every US state capital and every city that hosted the Olympics but you get rusty if you don’t practice so I wouldn’t back myself any more on those.
I’m not an insufferable know-it-all… I don’t actually have any knowledge of these things outside of just pure memory. I just do it for fun when I’m bored because I’m a sad act.
I also used to be able to balance about 30 coins on my elbow and catch them. Reckon I could still do 10.