Oh, this one I get! At times I experience a vague feeling of impending doom if I don't follow through with certain rituals, but from what you've written, I can absolutely see a person thinking up a specific disaster, that 'might' happen if they don't do things in the 'correct' way."Intrusive thoughts" is (also)!the terminology for what certain kinds of OCD sufferers face when projecting the disasters that can befall if they don't do their rituals properly.
Thanks for posting this, JoeyLittle! It gave me some new understanding of what an intrusive thought might encompass - i.e., a lot more than I had realized.