Spraying any of the NPC characters. They'll yell something like "NOOOOOO!!!" and a string of random angry gibberish. Except for the Nokis and the Sunflowers and Peach; the Nokis just retreat into their shells, and the sunflowers mumble gibberish that sounds like "Oh, I'm loving this!" Peach just blocks the spray with her umbrella, and the biggest sunflower giggles an adorable sound like "lo-wanny-hee-hee-hah!"
Chuggaaconroy: (annotation for video: Oh, I'd love a dick!) "I swear, that's what I thought they said as a kid!"
Talk to Toadsworth. Sometimes he'll just scream what can only be described as "YABLABBABLABBA!"