Burnt Toast for Drunk, Clams
Not only can burnt toast sober up the hung over, it can also cure cancer in clams.

Said environmental engineering professor Dick Luthy:
"They’ve known for a long time that an antidote for certain kinds of poisoning is to give activated carbon. You sorb up [the poison] with the carbon and it passes through the gut and is eliminated. And if you don’t have activated carbon, in a pinch you can use burnt toast.”

Why cure clams? The cancer-causing PCBs don't kill the clams, but do impact things higher in the food chain (ie people, or sharks).