Wait a second... You don’t even know sign language! But that shouldn’t be a problem; she most likely doesn’t know sign language either.
You start making some wild, random hand motions, which Pinkie follows with a careful eye.
Suddenly she gasps; “What did you say?!”
You make some wilder hand motions.
“What about my mother?!”
This is going poorly. You make some more hand motions.
Pinkie’s glare intensifies. “How would YOU like it if I shoved yours in a meat grinder instead?!”
Wait, meat grinder? Hey pal, I don’t know sign language either, I have no clue what you said!
You make some very hesitant gestures (you’re a slow learner, you know that, right?). Pinkie gallops over and plants her hoof firmly in your face. Almost instantly you black out from the pain. When you wake up, you find yourself dangling from a branch in the Everfree forest.
Perhaps it’s not a good idea to return to Sugar Cube Corner. Ever.