Muffin was the only cat Angry Grandpa ever loved. It is known that Angry Grandpa hates cats because of what happened to Muffin. Grandpa denies Muffin's existence.
Appearances (mentioned only)
- GRANDPA DESTROYS A TOASTER
- WHY GRANDPA HATES CATS
- Apparently the only cat Angry Grandpa has ever liked (other than the one-eyed cat at the Charleston Animal Society).
- Muffin was a stray cat that the Green Family found.
- Muffin supposedly was greedy when Grandpa had Muffin.
- Grandpa gets angry when Muffin is mentioned.
- According to Kimberly, Muffin was killed due to Angry Grandpa closing the recliner on Muffin, killing it.