It gets better when you give the Tengu Mask or the Naughty Novel to Oyu and combine either of them with the Love Potion.
More fun with alternate "joke" costumes: Jubei and Oyu's 70s-style outfits. Wear them and watch the cutscenes.
Ekei's disappointed reaction when he discovers that the villager's daughter he offered to rescue is not a sexy, nubile young woman, but a baby instead. However, the scene promptly turns into Mood Whiplash when the crying baby triggers bad memories for Ekei.
Onimusha 3: Demon Siege
When Vega Donna orders Heihachi to finish off Jacques... and he refuses. Her outraged reaction sells it.
Samanosuke's panda suit makes a return... and this time it's even better, as, not only does it now have two little panda plushies in the pouch at the front, it also has five different facial expressions, ranging from a sinister grin to giant glistening eyes. Have fun!
Onimusha: Dawn of Dreams
When Jubei states that only the Yagyu sword can slay a Genma and tells Soki to stand back. His answer? Slashing down one of them with his sword saying: "Is that all ?". Cue to Jubei's face....
The scene where Jubei meet Minokichi for the first time is pretty funny. In shorts, he accidentally scares the crap out of her as she's crawling under a fence (causing her to hit her head) and then she tries to shank him.