Two terrorists stand over a table map of the United States in a darkly lit room somewhere in Northwest Pakistan:
Terrorist #1: At last, our dreams have come true: We have secured enough nuclear material to produce a dirty bomb. Where shall we strike the American infidels?
Terrorist #2: New York? Washington?
Terrorist #1: No. Too obvious.
Terrorist #2: [scans map intently] Hmm … we could hit Tioga, a thinly populated oil town in North Dakota. That would be somewhat bothersome.
Terrorist #1: Perfect.
The end.