Devil May Cry/Fridge

Fridge Logic

 * In the form of a What the Hell, Hero? for Sparda, several fans have wondered why exactly Sparda didn't leave his family with the Vie de Marli for safekeeping considering that he helped them kill an evil demon god (thus meaning that they probably owed him a favor) and that they were more than capable of warding off some measly demons sent by Mundus. The potential problem is never addressed in-game.
 * Considering Sparda's age, it's quite possible he helped the Vie de Marli decades before meeting Eva. We also don't know what happened to Sparda, maybe he planned to do it but was killed before he could.

Fridge Brilliance

 * I was going through the Hard difficulty on Devil May Cry 4, and getting my rear handed to me by Dante. On the third try or so, I was getting a bit frustrated with the fact that he kept pulling out all the extra weapons that he didn't have on the Normal playthrough, then I realized: Hey, I'm going through a New Game Plus, that means all the stuff I've gotten carries over to the new game, and yes, that applies to Dante too, even before I get to play as him! - Reflextion
 * In Devil May Cry 4, Nero could use Devil Bringer to save Kyrie on at least two ocassions. Plot Induced Stupidity much? However, the only things you use the Devil Bringer for in-game is as a grappling hook against non-corporeal targets or to lay the smackdown on the bad guys, neither of which requires a delicate touch, unlike saving Kyrie from the baddie. He does try and grab her using the arm at one point, but it's not using it's supernatural giant-grabbing-ghost-hand power. Perhaps the Devil Bringer is incapable of being used in a gentle manner?
 * Many people wonder why Cerberus, a hellhound, is an ice elemental in DMC 3. Anybody who has read Dante's Inferno (or at least studied up on it), however, would know that in the ninth circle, Satan was encased in ice. Another nod towards the epic, perhaps?