Free Will - The Storyteller
To cross the river you need to pass the deepest bit.
This one takes us right into the abyss, only to leave us with a glimpse of where the exit might lie. Sorry to keep you hanging.
Erratum: the instruction was flashed up in the left half of the field of vision, so that the right hemisphere of the brain would process it.
Erratum 2: and they will absolutely believe that that is the reason why they went to the DOOR, not the toilet.