[panel 1]

Human: Oop, looks like Muffin found a greeble!

[panel 2]

Other human: A greeble?

Human: Yeah, they’re like invisble gremlins that like to mess with cats. 

[panel 3]

Other human: Haha, it must really be going wild down there.

[panel 4]

The greeble is just a little guy and he's just waving at Muffin