This is normal. If one is the victim of intrusive thoughts, it doesn’t mean one is absolutely lunatic.

No it doesn't
You learn to use the constructive thoughts or the one's you like or the safe ones for your benefit

If my thought dreams could be seen they'd probably put my head in a guillotine. ~Bob Dylan.

I am well aware of what intrusive thoughts can do to a person. It’s not always easy to get them out of your head.

You can't help the thoughts the sneak in there