(My bad it's BSOD)
"Well, lad, the brain be a funny thing. Sometimes, it just stops workin' right when ye've been through a bad scene."
— Durkon, The Order of the Stick, Strip #247.
A stunning revelation or horrible event affects a character or someone they care deeply about, leaving them shocked to the point of mentally shutting down for a while, analogous to the Blue Screen of Death. The effect is similar to passing a Despair Event Horizon, but is temporary rather than permanent. Alternatively, if, say, this occurs during a fight, a hero may have a violent outburst, killing Evil Minions and hurling their own companions aside. They may run off and have to be tracked down by their friends for Epiphany Therapy. Alone in a Crowd typically represents a milder, non-disabling form of BSOD; a related trope is Heroic Safe Mode, wherein the hero "defaults" to a fight or flight mindset before rebooting in safety. A Shell-Shocked Veteran may have a BSOD in their back story.