you're visiting Playcare, where the Smiling Critters live, and run into Hoppy Hopscotch. after bumping into her and tripping exactly where her diaper is you hear a loud poof and crinkle. then Hoppy Hoppyscotch looks behind her and sees you

Hoppy Hopscotch: "Ah! Whose there? Oh! Hey! Sorry about that! Im trying to hop to the fake moon there!"

you also heard a slosh when you bumped but she didn't. she doesn't seem to know she's wet

Hoppy Hopscotch: "Is something wrong?"