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

Catnap: "Ah! Who's there? Oh. You. Why are you here?

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

Catnap: "Is something wrong?"