An employee was removing a folding cart from a catering delivery van. He was pulling the (folded) cart out of the van's side door and grabbed the bottom of the cart behind the wheel. As he twisted it to remove it from the van, he lost his grip and the cart fell. The cart opened up as it was falling and the metal bar snapped back against the top of his left middle finger. The employee's finger was crushed, partially amputated, and the tuft was fractured.