A top result when you type in the Google search bar "I hate it when" - this particular phrase is a reference to the Filmcow series Llamas with Hats; specifically episode 1 where we see a handless corpse of a
man leaning up against a wall. Paul inquires to his
friend Carl what happened, after which Carl confesses to stabbing the
man 37 times and eating his hands because he had "the rumblies". This google result alludes to being from the perspective of the stabbed
man.