"You didn't see anything" is not the name of a trope, but you may be looking for one of these:
- I Was Never Here: This trope was never here, no matter what you think you saw. Associated with The Men in Black, if such an entity existed.
- You Didn't See That: This trope is very embarrassed by an incident in their past.
If an internal link brought you here, please correct it to point to the appropriate trope.