Just tell her I said the obnoxious German customer would never bother her again.
There are other codes to tell other drivers that a popular taxi rank is empty (or full), or warn of drunk or obnoxious customers trying to hail a taxi.
At the drugstore, an obnoxious customer, who claims that the war was fought against the wrong enemies, gets into a fight with Homer.
After overreacting during an argument with an obnoxious customer (Kevin Hart), Jay reveals that his girlfriend Jill broke up with him after learning he has been cheating on her.
I've done barwork and waitressing and met my share of obnoxious customers, but anyone who actually threw a drink or anything else at staff would get chucked out pronto, thankfully.
The grueling hours, staffing headaches, infinite opportunities for employee theft and supplier deception, obnoxious customers and reams of regulations should be enough to make any sane person avoid such a career.
The hobgoblins were equally obnoxious customers.
The next time you're tempted to vilify a particularly obnoxious customer or agency or search engine, realize that this failed interaction is the best thing that's happened to you all day long.
"Hey, she-lion, I could use you upstairs for a few minutes, and your skinhead friend, if he can help toss an obnoxious customer."
Chester the Cheetah persuades another customer to toss Cheetos onto the ground, attracting a flock of birds to drive away the obnoxious loud-talking customer.