Warning: Spoilers Off applies to this page. Proceed at your own risk.
Doing the carnival games, which requires the player to do three separate things at the same time. At the start, the player needs to guess the carnie's age while popping a balloon with a dart and driving a nail down with one hammer swing. The final challenge is to cut a Gordian Knot without cutting it, create a square with the same area as a circle, and break an egg by yelling at it.
You can choose to defend the children of Largemouth Bass & Sons from Occams Gator, so that they can escape to the city and away from their parents' repetitive cycle of deboning and then reboning largemouth bass. It is a fairly challenging fight, but at this point you are the only one capable of breaking the cycle of misery that is keeping them trapped in the Big Moist.
While chasing down the king of the swamp, you can either fight his security system...or with enough Moxie, you avoid the lasers by doing a Silly Walk back and forth while dodging the lasers.
If you can meet the skill checks in your final confrontation with Terrence Poindexter, you invent an entirely new kind of Jazz, Completely Random Jazz, by using a pair of dice to determine your next move. When Poindexter begins to decipher how you're interpreting the dice, he dodges accordingly, and you're right there to catch him, because this time you ignored the dice.
Against Dark Noel, you and her are evenly matched in a wizard's duel, cheese versus Crimbo. Eventually, you decide to change up the tactics by faking a spell and running up towards her. By the time she realizes the feint, you tie up her hands with string cheese then proceed to rapidly punch her while shouting "Gouda" repeatedly like a certain anime.
Against General Bruise, you challenge him to an arm wrestling match TO THE DEATH. The two of you are locked in an endless stalemate, your strength is more than a match for General Bruise and neither can fully overcome the other, forcing Bruise to try and break your concentration with shadow magic; but you power through his trickery and eventually defeat the general through sheer force of will.
The prompt to initiate your final confrontation with The Shadowcaster, encapsulating both the latter's incomprehensible power and terror as well as your own character's guts for facing it: "Benotafraid."
During the ending sequence, you have several different ways of destroying Margaret's umbratanium pylons. Murray mentions that the umbratanium alloy that they are made of is extremely resistant to damage, but by carrying out sequential tasks given to you by Don Toblerone or Rufus, you can call them in to swiss cheese the offending pylon or warp it out of existence, respectively. Alternatively the player can destroy the pylons by just beating the crap out of them with their bare hands, although that comes at a price.
Every single companion apart from Adams gets their own little moment of awesome when confronting the Shadow President, each of them able to defeat her single handedly:
