Continuing playing with the idea of quirks that replace favored class bonuses. In this case, playing with some ideas for the uncontrolled psychic trope.

Screaming Brain

Sometimes, bad things sometimes happen to those who hurt you. You aren’t always conscious to see it, though.

Only characters with the Psychic Sensitivity feat (Pathfinder Roleplaying Game Occult Adventures) may take this quirk. They may take it in place of any favored class bonus.

Select one skill that has an occult skill unlock, and which you have ranks in. You cannot use this skill’s occult skill unlock, despite having Psychic Sensitivity.
Select a spell from the psychic spell list that lists one or more targets, and which has a spell level no higher than 1/3 your character level (minimum 1st level). When you are forced to make a saving throw by an enemy, and your die roll is a 5 or less, and you fail the save and suffer the full effects for doing so (without the effect being negated or reduced by some effect or ability), as a free action you must target the foe that forced you to make a save with the psychic spell selected. The spell affects only that target, regardless of how many targets it normally affects. This happens even if you are knocked unconscious or killed. You are dazed until the beginning of your next turn, and staggered on your next turn. At 6th level, and every 3 levels thereafter, you may change the psychic spell selected.

After this ability has been activated, it does not activate against until you have regained uses of your daily abilities.

You may select this quirk more than once. Each time you must select a different psychic spell. When this ability is activated, determine which spell is cast randomly among those you can still use today. Each spell can be used only once per day, when all have been used you can no longer use this ability until you next regain uses of your daily abilities.