for me i have intrusive thoughts that everything i say or even write could became false like if something happened before and i talk about it or type about it would somehow undo and people would be like what are you talking about and treat me like im completely insane and it doesnt matter whether it happened 2 weeks ago or 50 years ago people engaging in 20th century historical revisionism for political proposes drives me crazy because it makes me think i completely irrational for believing in facts and my intrusive thoughts say that reality could change to their inaccurate perceptive if i think about it too much anything before the 20th century doesnt bother me i guess its because it feels so distant  i hate how my brain makes intrusive thoughts that makes reality seem is like sand moving with around rather than a floor or concrete or firm ground