02.21Are you on drugs?
I learnt a good idiom from a student yesterday:
気は確かか? // Ki ha tashika ka?
It means something like, “Are you on drugs?” Or, “Do you have rocks in your head?” Another version is this:
気でも狂ったのか? // Ki demo kurutta noka?
It is maybe a little more interesting than something like: ばかじゃない?
