Unbendable girders

Unbendable girders have been bent in two different episodes. Bender bent one at Curvetti Bros. Bending Plant in 3002 and a different Bending Unit bent two at once at the Earth Olympiad in 3004. Tina Belcher once gave bender a challange. If he could bend an undbendable girder, he would not get raped. He could not bend it, so Tina Belcher regularly rapes him. She offers this challange to many bending units.