A congressman and his constituent were walking in the woods when they came upon a metaphorical bear representing the insatiable appetite of an unsustainable set out outlays and deficit spending extending decades into the future. The congressman sits down and starts putting on tennis shoes. “Hey, you cannot outrun a metaphorical bear,” the constituent says. The congressman replies, “I don’t have to outrun the metaphorical bear; I just have to outrun you.”
Update: Thanks to Tam for the link.