mysqldump: Got error: 1066: Not unique table/alias What usually causes this mysqldump error?

exec error: Error: Command failed: mysqldump: Got error: 1066: Not unique table/alias: 'TableFoo' when doing LOCK TABLES
A common case for this error is when the same table appears more than one in the mysqldump list of tables:

mysqldump [options] TableFoo  ... TableFoo ...