You boop it. It confuses the cat. Cat looks at you like "What.....was that all about? You touched my mouth and now you're giggling like a maniac. I'm unclear on what this human social interaction is. Am I supposed to touch your nose now and giggle like crazy? I have a better idea. When you lay down in bed, I'll stick my cat butthole right in your face. It's ok. You sniff. I'll allow that."