Boing!

I've seen this happen so many times with real-world Smudge. She spots something to pounce on, her eyes dilate to black holes, her whiskers move forward, she crouches down, her bottom starts waggling, her head tips jerkily to one side and then she pounces... and it all goes wrong. It's like cats sometimes get so excited that they short circuit.

Incidentally, I should have coloured in Smith's tongue in panel three.