"Don't wet yourself," my mother-in-law Corkabee says. "I almost did." She looks me straight in the eye, something she usually doesn't do unless I am under suspicion for a misdeed. I cower instinctively. Then she unloads her bombshell. "There's a spaceship in the Potomac." I stare at Corkabee. I don't know what to think. I don't know what to say. So, I do what all young men do in similar circumstances. I repeat what she just said. "A spaceship...