There are so many games, I can only name a few on the tip of my tongue;
-in Skyward sword, when you suck up Demise's Lightning and then Wave it back at him.
-in Final Fantasy 8, When you spew out a 9999s damage Lionheart at level 7.
-in Devil May Cry 1-2-3...Pretty much anytime.(I don't like 4
)
-in Age of Empire, When you select them puny humans and hit delete...MHuahahah...MHuahahahahahah!!...*cough*
-in Starcraft...By playing and being good XD
-in Diablo 2 with a Smitadin
-in Ultima Underworld 2 When you use smite over and over(glitched debris item) on Mors Gotta
-in Megaman, Megaman X, Megaman Zero, Megaman ZX...Y'know...Cause you pewpew stuff into disappearance.
-In Dragon ball Z Games; Because Why Not? I mean, Overpowered starts there...no? lol
-in Final Fantay X, when you Blitz Ace or Attack Reel 99999s
-in Castlevania: Harmony of Despair, Order of ecclesia, Aria of sorrow, and circle of the moon.
-in Resident Evil 5 (Not scary + Over powered Magnum? I feel empowered! MHuaha!)
-in Fat Princess, When I kill 3+ people in one charged attack
-in Final Fantasy IV: TAY when you use the Final Fantasy Band =D
-Sengoku Basara, Dynasty Warriors, Drakengard, Warriors Orochi. Because you're one human beating thousands of others (having a name makes you stronger apparently)
-When I first got Pokemon Blue when I was like 12-13, and I picked out Bulbasaur, I was on top of the world O_O
-Oblivion, When you're Archmage you're equivalent to a god. lol
-Neverwinter Nights when you bother leveling your darned Sorcerer until you get Time Stop and then cast other Magics during your time stop and when time resumes everything shoots at the same time, That makes me feel very strong.
I could go on forever, FFS this list would be endless! Videogames are awesome!