Beating World 4-4 of The Lost Levels after 1 failed 10-minute attempt.
Finally beating World 8-3, the clouds, after 4 videos of failed attempts.
Billy: I think I got it! Awwww, yeeeeeeeeeeeeeah! Yes! Yes! Yes! I got it! I got it! I feel like a ten-pound monkey and a hundred pounds is off my back now!
"...I beat the game. After how many attempts, after killing Mario needlessly about 100 billion times, I beat the game. ...I'M SO HAPPY! I'm HAPPY! I BEAT THE GAME!"
Billy vs Death in Castlevania. He utterly curb stomps Death.