Eye of Cthulhu

The Eye of Cthulhu is a boss in Terraria. It is commonly the first boss on both modes. On Normal Mode, it is seen as pretty easy and generally goes down with no death. On Expert Mode, it is very fast and deadly.

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Kill Count

PBG, Jeff (PBG Terraria #1)
RJ, Zarnexith, Cri, Wist, Connrad (User Terraria Expert #1)

Survivors

PBG, Jeff, Balmung135, McJones, Lucahjin, Yungtown (PBG Terraria #3)
Fletchling, Mario, Ruehl, Mommavan, August (Sonicraft's Terraria #1)

Defeating the Eye of Cthulhu

The Eye of Cthulhu's only job is to ram into you, with a few additional attacks to help out. After 50% HP the Eye the attacks start doing double and have new attacks. On first phase it spawns minions and on second phase it rams into you. On Expert Mode, it charges super fast and chases you.