#1582: Picture a Grassy Field

XKCD comic, described below.
Transcript

[[A person monologues to their friend.]] Picture a grassy field. In the center sits a small, pale, big-eyed creature with the power to escape from any visualized scene and move freely through the brain that imagined it. It glances around nervously and-- --whoops, where'd it go? Sorry about that! Keep an eye out for it in your daydreams.

Wait, I can fix this. Picture another field. In the middle sits the only creature the first creature is afraid of. Now just-- wait, where did THAT one go?

ExplainOriginal