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People are outraged once again by out-of-control tipping culture after an airport self-service checkout asked for an 18 percent tip.

Nearly 80 percent of consumers said tipping practices have become ridiculous in a March study from restaurant tech company Popmenu. Now, Newark Liberty International Airport in New Jersey has become the lightning rod.

“Anyone else being asked to tip…nobody?” Clay Moss, a doctor who shares health videos on social media, asked in the caption of a recent Instagram video.