Grouch or grump? Oscar the Grouch and Grumpy Cat came fuzzface-to-fuzzface in an epic showdown to settle the debate.

Repeat: OSCAR THE GROUCH and GRUMPY CAT.

See also: Grumpy Cat Wears Costumes to Hide From Fans

Sesame Street's trash-loving Muppet made fast friends with the curmudgeonly cat as the duo bonded over hairballs and frowns at Mashable HQ. But no encounter between the world's most famous sourpusses would be complete without a grouch-off — or grump-off.

This is the Edison versus Tesla or Ali versus Frazier of our time, Internet.

Oscar the Grouch Meets Grumpy Cat

Image: Mashable