There is not typically a (discernible) pattern to my thinking, and conversations thus bounce from Elizabeth Báthory to Muppet Babies without skipping a beat.
There are occasions, however, when I get stuck on a word game of my own devising, and no matter how obnoxious it becomes, I helplessly plow deeper and deeper into it.
If, for example, someone says, "She was… well, um…" I am left no choice but to spit out all of the adjectives in my vocabulary, however logically inappropriate they may be: grisly, Canadian, contemptuous, beautiful, decapitated…
Call me sometime.