You can have wild and crazy thoughts.

你可能有疯狂的想法。

youdao

A thousand crazy thoughts barged into her head as she peered at an apparition.

她看着这个幻影般的人，千万种疯狂的念头涌入脑海。

youdao

This month will be a good time to take control of your crazy thoughts and face your fear of not doing or being enough.

这个月将是一个好的时机去控制你疯狂的想法，并且面对你所惧怕的没有去做或者没有准备好的事情。

youdao

More than anything else, I realized, it had to be boring to be crazy, to think the same sequence of thoughts and come up with the same set of bizarre conclusions, to voice those conclusions using the same words, several times an hour, day in and day out.

NEWYORKER: The Reptile Garden