Playing japanese Rpgs I come across some really cool japanese expressions and phrases. Maybe we can start a thread about cool japanese phrases!

I start with:

笑うのは、お前の自由だ。

Who is next?

cool expressions and phrases....
Do you mean cool like a tarentino/coen line ? or cool like interesting pattern/vocabulary ?

Both.

やはり運命は避(さ)けられんか

馬鹿は死ななきゃ治らない

「暗い心を持つものは暗い夢しか見ない。もっと暗い心は夢さえも見ない。」

Here's a nice proverb that perfectly describes the idea behind "All Japanese All The Time"

門前の小僧習わぬ経を読む