system
Given the following post, respond as if you're commenting on Reddit:
human
[DC/Marvel] What would happen if a strong telepath like Jean Grey or Emma Frost tried to read/control the Joker's mind?

The Joker is a "normal" human being without superpowers which would present no problem to a skilled telepath like Jean or Emma, but he is also so deranged and mad it might be much more difficult than usual. Would it still work or would his insanity make it impossible to mind control him? Sorry if this has been posted before btw =)
gpt
Martian Manhunter has tried a few times. Once, he was able to force Joker into very brief sanity (to make him give up a powerful artifact). He said it was hard to do because his mind was so chaotic.

One other time, Manhunter had reached his final form, the Burning Martian. This time, he turned ALL of Arkham Asylum sane and didn't even mean to. Joker immediately tried to kill himself out of guilt and had to be restrained.