I suffer from it and anything can trigger it. It get's triggered every two minutes or so, obsessive-intrusive thoughts torture me non stop. Violent thoughts, embarrasing thoughts, humiliating thoughts, angry thoughts. Anything goes, it's like I have a torturer inside my head that makes me anxious and angry and miserable all the time. People can't understand this shit. It's pure-o form of OCD, with mental compulsions and rituals. It feeds off my worst fears and traumas and it made my life living hell for the past ten years. Every single waking moment is pain. It also adds new scenarios, I can't even jerk off without getting some bullshit torturing image inside my head. It's hell, living hell.