Occasionally the wandering heroes or mercenaries will trip upon leaving. Oh the setbacks of having Floating Limbs...
Some of the cutscenes between Gold Bone and his crew member are pretty funny. One example is after finishing the first planet, Leisura. After the crew member reports most of the rest of the crew went on shore leave, Gold Bone asks why he did nothing to stop them.
Crew member: "Heh. It kinda slipped my mind."
In the final battle against Gold Bone, he fires a beam that needs to be dodged. There is enough power for three charges, but he confidently tells his minions that he'll only need two. After two beams are evaded, he goes to fire a third... The laser does not fire. Turns out his minions took him at his word when he said he only needed two and used the last bit of that energy to heat a kettle.
The weapons in Battleground Z. Using fancy clothes, boom boxes, pop-up books, and other strange items are funny on their own. The charged attacks often crank up the silly factor.
Some of the cutscenes featuring Coraline's father in Ultimate Angler are good for laughs.
When you succeed in catching Nessie for the first time:
Coraline: Dad! DAD! Check it out! [Player's name] just caught Nessie! And I was JUST thinking there hadn't been any news about Nessie in a while. Coraline's dad: I would have assumed it was a new species, but it matches the accounts of past Nessie sightings perfectly. The only possible explanation... is that there's some sort of time-space portal linking our waters to Scotland! Coraline: Um... Not sure that's SUPER-sound science there, Dad...
Reel in a Dragon for the first time, and you get this exchange:
Coraline: Dad! DAD! Check it out! [Player's name] just caught a... Well... It looks like a dragon?! Coraline's dad: I'd say... that most definitely... could be a dragony thing of some kind... Coraline: Daaad! Is that REALLY the best you could come up with?! Coraline's dad: Crying cuttlefish, Coraline! I'm a marine biologist, not some sort of a... a... dragonologist!
When you land the Kraken for the first time:
Coraline: Dad! DAD! Check it out! [Player's name] just caught the Kraken! Coraline's dad: Indeed it is, Coraline. A mighty fine cephalopod specimen, if I do say so myself. Coraline: ...Huh?! I can't believe you can be so calm and scientific at a time like this. I mean, it's a SEA MONSTER! Coraline's dad: Well, my research HAS advanced a fair bit lately. I can see the scientific side of all sorts of new marvels! Why, I expect I'll figure out how to explain something like THIS through solid logic any day now. (turns to player) Yep, aaaany day now. (cough)
At the end of Ultimate Angler, you meet the alien whose UFO you reeled in. After explaining how he came to Earth to study humanity, he realized how there are humans who care about the planet. He then casually mentions that he'll have to tell his superiors to cancel the plan to exterminate humanity.
Any software that isn't SPMP itself can qualify as a Mii's last-played game, even if it's non-game software. It's not uncommon to meet Miis who tell you that they've been "playing" System Settings or Health & Safety Information recently.
Also interestingly common is Mii Maker, suggesting that the Mii you're seeing had just been created to be showcased in StreetPass Mii Plaza.
Sales bunny's summaries of what each of the new games in the September 2016 upgrade are pretty hilarious.
Market Crashers is about money! And lots of it!
Feed Mii is about cooking! And saving the world!
Ninja Launcher is about courage! And ninjas in cannons!
Speaking of Ninja Launcher, there's your Mii's reaction to Shinobu's plan to fire them naked from a cannon.
There's also Shinobu, who normally speaks in a formal manner, saying that their enemies will be "toast."
In order to get around the whole "naked" thing, you have to get clothing scrolls in order to equip yourself for battle. Do well enough and you go from a Ninja to start equipping a caveman costume.
The custom car feature of Slot Car Rivals allows you to make the most impractical, ridiculous cars imaginable, and they'll still race fine. Anything from an absurdly tall car to a tremendously long car is yours to make and race.
The Jumbo-Sized versions of the dishes in Feed Mii not only have ridiculous portions piled onto plates and bowls barely big enough to hold them, they are still plated and arranged with style, just...comically huge. For instance, serving tuna terrine, each hero ordinarily gets one slice. Jumbo-Sized tuna terrine gives them two entire loaves with two more slices for good measure, still plated elegantly. The Jumbo Sized pizza margherita consists of five such pizzas, served straight on the racks normally used to sell pizzas from. Jumbo Sized pot-au-feu is served in the cauldrons they were cooked in, Jumbo Sized seafood paella is big enough to fit two entire lobsters onto it, Jumbo Sized jambalaya is served in an incredibly tall stack almost as tall as the Miis themselves, and Jumbo Sized roast chicken is three whole roast chickens stacked on top of each other, the one on top with a little blue ribbon tied into a cute bow.