This is based on opinion. Please don't list it on a work's trope example list.
Nightmare Fuel / The Impossible Man
The Impossible Man is a walking Nightmare Fuel. To put in perspective, the entire world features stuff like magic, giant robots, and Urban Legends, yet these are considered normal amongst the common citizen, but when The Impossible Man uses his powers, it's incomprehensible to them and leaves those who witness his actions in a state of disbelief, or worse.