What are you ashamed to admit you don't understand?

I'm disappointed in myself that I don't understand theoretical physics, or how an engine REALLY works... I get the basic gist... But I really don't understand...

I don't understand a lot of things I'd like to understand :(

Some people should be ashamed that they don't know how the US government works and don't bother to run in elections and vote. We need better candidates to vote for who win and actually represent the people in our country.

how twitter works. obviously it's a big deal because i hear people are "tweeting" like crazy, but i have no idea how the whole process goes. of course, i don't care either, but it's a little shameful i don't even have an idea.

Rap Music

I am ashamed to admit that I do not understand the Offside rule in football .

Wall Street.

nothing really

I mean I'm not ashamed, not that I understand anything - whatever I mean

why Cody Rhodes and I aren't married

The way the world truly is

nothing