The world’s deadliest spider reportedly found among produce at a Whole Foods store in Oklahoma. One expert says it was a Brazilian wandering spider, the dangerous one, but another says it was a Huntsman spider, a non-lethal arachnid. Either way, with the widespread fear of spiders of any kind that people in general exhibit, there may be a drop off in produce sales at Whole Foods for a while.

But if you’re bitten by a spider at Whole Foods, there’s a way to determine quickly if your attacking arachnid was a Brazilian wandering spider, experts say:

Patients not only experience overall pain and an increase in blood pressure, they also get an uncomfortable erection.

In Brazil, emergency room staff can immediately spot the victims of a bite.