Some tests, such as casting spells or firing Rapid Fire, have additional effects in case of “Mishaps.“ A Mishap is a natural roll of 1 on the first die roll when testing a skill or attribute total. Don’t count 1s that come up as part of rerolls, Up results, or spending Possibilities—only for the first die rolled. Some situations might expand the range of Mishaps, such as 1–2 or even 1–4. This may also add extra consequences to a Mishap. This is explained in the particular section whenever necessary. If multiple conditions apply, they all trigger on any Mishap.
A roll of 1 always fails, and no Possibilities may be spent to change it. That means even characters with the highest skills and attributes aren’t always successful.
Other Mishaps, such as those that are triggered by a natural roll of 2, 3, or 4, for example, may be successful if the total is high enough (or more likely, Possibilities are spent), but the action still triggers any applicable Mishap consequences.
Looking through uses of the word "Mishap", it seems that Mishaps are specified by different skills and situations... For example, driving a vehicle, a Mishap causes a collision. A Mishap on reconnecting causes a transformation. On casting a spell, a Mishap makes the caster very stymied.
So there are three interpretations: First, a Mishap ALWAYS occurs on any skill test and causes a failure AND something else bad to happen, and in certain conditions the nature of the Mishap is defined specifically in the text, but in other conditions, the GM makes it up. The second interpretation is that a mishap ALWAYS occurs and the GM should ALWAYS make up added bad effects, and for some tests there are ADDITIONAL effects (so, the Very Stymied on a spell roll of 1 is in addition so another Mishap). The third interpretation is that a Mishap is simply an auto-failure (a roll of 1, in which possibilities cannot typically be spent), and that for some tests an additional effect occurs (collision for vehicles, etc.).
We've been playing the second interpretation, but now I'm starting to think it's actually the third interpretation: Basically, the definition of a Mishap IS an auto-failure with no allowance for re-rolls, and for certain types of tests there may be ADDITIONAL effects that occur.
So, let's say someone is doing something with no contradiction and no specified mishap (for example, making a simple persuasion or streetwise roll). A 1 always fails, but would not disconnect.