There are plenty of things you should lick in this world: Ice cream from the ice cream truck, the salt on a frosty margarita, a candy cane around the holidays, if you like peppermint.
But there are a number of things you really should not put your tongue on. Item: In Japan, people are licking each others eyeballs, a new fad called oculolinctus. The result? A spike in eye infections, scratches, styes and general eyepatch wearing.
With this in mind, we offer a list of 5 other things you shouldn't lick, plus a couple you really should.