After a plaintiff collects from a jointly and severally liable defendant, that defendant may force co-defendants to pay her contribution proportional to their blameworthiness.
For example, suppose that A and B negligently injure V. Suppose further that V successfully sues A and B for $100,000, and that the jury finds A 10% responsible for V's injuries, and B 90% responsible. Because A and B are jointly and severally liable, V may collect the full $100,000 from A. A may then demand that B pay his share of the judgment - here, $90,000. If, however, B cannot afford to pay his full share, A is stuck paying both his share and B's share. See, e.g., Walt Disney World Co. v. Wood, 489 So. 2d 61 (Fla. Dist. Ct. App. 1986).