Everybody hates telemarketers. But here’s a guy one telemarketer really should not have called—Ted Frank, the founder of the Competitive Enterprise Institute’s Center for Class Action Fairness in Washington, D.C.

Frank is an expert in class action procedure and well-versed in the law that makes it illegal to auto-dial consumers without permission. Sure, he’s notorious for objecting to class action settlements. But after receiving a particularly annoying call asking about a vehicle he no longer owned, Frank was ready to turn plaintiff, filing a class action on Friday against the call-center operator.