4. The Penetrator boss, unbeknownst to the playerbase in the PS3 version of the game, began a trend shared only by "Dark Souls I's" Knight Artorias and "Dark Souls III's" Slave Knight Gael. What do these three share in common?
From Quiz "Demon's Souls" - Bosses II
Answer:
Throwing a corpse at the player before the boss fight
The cutscene for Penetrator begins with the Fat Official, the one who has been trolling the player since the Tower Knight boss fight, laughing as he rushes towards the door to let the Penetrator in to deal with the player. Apparently, even the Penetrator himself grew irritated with this Fat Official because he impales the Official with his huge sword as soon as the Official unlocks the door, kills the Official, then tosses the corpse at the player, flicking him right off of his huge sword. The Penetrator then bows, holds his sword up high, and the fight begins.
Both Knight Artorias and Slave Knight Gael have virtually the same entrances. It is unknown why FROM Software retains the act of throwing a corpse at the player, but it has become a fan favorite fad which has served to make these bosses more memorable.