Suspicious Grinning Eye

The Suspicious Grinning Eye is a Master Mode-exclusive drop from the Eye of Cthulhu. It summons a Suspicious Eye pet, which resembles the Eye of Cthulhu. It normally shows a blue iris and pupil, but when moving rapidly (such as when dashing or jumping) the pupil slides up and reveals a mouth, similar to the Eye's second form.

Trivia

 * The tooltip is a reference to the Suspicious Looking Eye item (or Suspicious Looking Eye light pet) and how the name of the pet, Suspicious Eye, is seemingly missing the word "looking".
 * While equipping Suspicious Grinning Eye, Suspicious Eye pet will always in front of player (if player is standing still). But after equip Suspicious Looking Eye, the Suspicious Eye pet will be pushing to the back of the player and Suspicious Looking Eye light pet will be in the front.