There was a Seinfeld episode where frozen yogurt is being passed off as "non fat." Only problem is, everyone eating mass amounts of this frozen yogurt start packing on some pounds. So they get the frozen yogurt tested. Surprise surprise, the frozen yogurt contains fat.

Now, let's take this scenario to another level. Lobster rolls, that don't actually contain lobster. Eight total sushi restaurants in San Diego recently pleaded guilty to violating a state law that prohibits the mislabeling of food items, according to prosecutors. There was even a ninth restaurant, but it already went out of business.

Just like in the Seinfeld episode, they took samples from the restaurants and sent them in for DNA testing. And every single one of the tests came back as negative for lobster. So basically customers were paying for a premium price (because let's be honest, lobster isn't cheap) but they were certainly not getting a premium product in return.

Investigators even went into the restaurants and asked to see their lobster or lobster invoices, and none of the restaurants were able to come up with either.

Now you might not think this is that big of a deal. But what if whatever that restaurant was using as a lobster substitute had something a customer was allergic to, but they didn't think twice in ordering the Lobster Roll, because it was being passed off as real lobster?