Apple is a minor antagonist who only appeared in the Annoying Orange episode "Kitchen Carnage". He was seen entering the kitchen, unaware of the fact he would likely be knifed. Before he arrived, Pear thought if he and Orange didn't say anything, nobody would die. They did their best to keep quiet, but Apple then started to insult Orange and Pear, and out of anger, they decided to let him get knifed without a care.
Annoying Orange Wiki