Whenever there's a chance to do something fun and dangerous, you're compelled to follow through immediately without tedious plans or precautions. Roll Resolve + Composure to be smart about it. More danger is more enticing, imposing penalties on the roll. Impetuosity is a Mild derangement.
Impetuosity compels sufferers to undertake more and more extreme risk-taking behavior. It can be tied to any number of underlying psychological disorders, or simply a facet of a more severe disorder.