Apply for position as an iOS developer. Nail the interview. Get the job. Get asked to write backend in JavaScript. Now I gotta learn JavaScript.

Unclear variables. It hurts.

when the comments in code directly contradict what the code is actually doing.

"Working with legacy code that hasn't been touched in 2 years is fun!!" said no one ever.

that moment when you have to look up how to spell the word 'table' because you read/typed it so many times that it doesn't look right anymore.

I really hate it when online sources aimed at educating people looking to get into programming attack specific languages. I'm ok with them recommending some good starting languages (ex. JavaScript, Python, etc.) but I find it extremely inappropriate and damaging when they list languages they consider "bad." Languages like JavaScript, PHP and Java constantly get called out even though they power a huge chunk of the web and services hundreds of millions of people use every day. IMO it's a huge disservice to tell beginners not to even look at these languages. We should be teaching the language isn't really what's important - it's what you build with it.

Everyone always says the previous developer was crap, sometimes you're right

Be clear, not clever.

99 problems but a conflict ain't one