It's Pitt, Arm Pitt

Student:  "Mrs. A, wouldn't it be great it Brad Pitt changed his first name to Arm?"
(silence)
Student:  "His name would be Arm Pitt."
(silence)
Student:  "It'd be like: '12 Monkeys starring Arm Pitt'."
(silence)
Student:  "So...you don't think that is funny?"
(silence)
Student:  "Arm Pitt?"
(silence)
Student:  "Yep, that is hilarious."