The way Musashi finishes off the Steam Knight. After he knocks it through a wall and off a cliff, it regains a bit of health, so what does Musashi do? Pick up the bot's ball-and-chain (which most likely weighs a ton or two), shouts, "HEY! YOU FORGOT SOMETHING!", before hurling it down onto it, causing it to explode.
Also counts as a Funny Moment when he then immediately falls asleep.