Saber: Theater of the Deranged allows her to attack the enemy even through any Guards, all the while weakening them and showing them the might of a Saber.
Archer: Unlimited Blade Works vastly increases the effectiveness of all projections, allowing our nameless hero to absolutely decimate the enemy with repeated use of Caladbolg or Triple-Linked Crane Wings.
Caster: Eightfold Blessing of Amaterasu removes her mana costs for one turn, allowing her to nuke down the enemy with her powerful spells.
Any time you block an enemy's Noble Phantasm with Rho Aias, particularly hearing the enemy's response.
The best moments were blocking Gae Bolg as a Continuity Nod and Gawain's Galatine, because his incredulous response is hilarious.
Blocking Gae Bolg was particularly satisfying because Luck is his Dump Stat, and the damage it does is based on luck, so it was either 'block it with Rho Aias' or 'get insta-killed'.
Isn't Luck the dump stat for all or most Archer players? After all, his E-Rank Luck is canon.
Twice: "Servant. I'd like to hear your thoughts on the matter. Do you think I'm evil and should be eradicated?"
Archer: "—My opinion? Discussing such things as a Servant may be a bit callow, even for myself."
Archer flashes a cynical smile tinged with obvious malice, as if he's come face to face with a sworn enemy.
As a Legendary Soul known to cut down all who stand in his way regardless of who they are or what they believe, Archer points his blade at Twice, a humane expression on his face.
Archer: "As a Servant I have no answer for you. But if you insist on a reply, I will do so as the human I once was."
Archer: "I've met many fools like you, hell-bent on destroying the present in an attempt to resurrect the past."
Archer: "Like those others, you try to justify your selfish desire for control by cloaking it in the guise of altruism."
Archer: "You're not satisfied with any result that ends in loss? Your immaturity and weakness makes me laugh."
Archer: "So, you asked me if I thought you were evil, right? You deluded, spiteful ghost."
Archer: "That's exactly right. Your misguided ideals are nothing more than the corrupted logic of one long dead."
Archer: "You are the epitome of evil; a lifeless shade who'd sacrifice the innocent for your own selfish goals.
Archer: "And regardless of what my Master thinks, I will be the one to eliminate you once and for all."
Rin's epic ownage of Shinji Matou on the second day of the first week, done to show him and the player the importance of getting the dirt on your opponent's servant.
Saber/Sir Gawain vs. Lancer/Vlad the Impaler in the Sound Drama.
Fate/EXTRA CCC
Enuma Elish , which crushes the enemy WITH A GALAXY.
Monji Gatou pulled a Heroic Sacrifice by passing through Jinako Karigiri's barrier, that would dissintergrate any trespassers from entering it, in order to obtain her SG for the Protagonist.
Shinji got himself killed by Meltryllis, in order for her to absorb his data due to his intelligence. But, what she didn't know that Shinji knew this would happen, that he infected himself with a virus a while ago. Once Meltryllis absorbs him, the virus would affect her, reducing her level from 999 to 1, giving the chance for the Protagonist to finally defeat her.
Archer being able to trace Excalibur in Unlimited Blade Works.
Should you have Gilgamesh and ask Andersen to evaluate him, Andersen will be calling out and roasting on Gilgamesh's flaws and story... and managed to be alive at the end of it! It takes guts to call the freaking King of Heroes out.
, which crushes the enemy WITH A GALAXY.