"What did the two lips say to the stomach?"
EEE HEE HEE HEE!
"AH HA HA HAAA!"
"GOOCHI GOOCHI GOO!"
"OH HO HO HOOO... Ahhh..."
EDIT: Thank you Reddit. In hindsight those eyes are pretty creepy. That stance was taken from that part in the Baby Cakes episode where Pinkie sees Pound Cake on the ceiling, asks "You can fly?!" to which "Ya ha ha" was the response. I guess I was already pushing my luck then the circular part of the face was compromised by Pound Cake's gaping mouth.