Someone started crashing my regular coffee group. How do we ditch him?

We have a great daily Starbucks group of about six to eight people who have been gathering for more than 10 years. Recently, “Bob” has been pulling up a chair, and he just kills the banter and the give-and-take of the group. He’s oblivious to his momentum-killing intrusion. He’s clueless. How do we get rid of him?

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