We can't figure this one out, so maybe you can. Security video footage of Ariana Grande and friends in a doughnut shop popped up on the internet today.

What is she doing in said security footage? Licking a display doughnut. What does she do next? Lick another one. And then she dares her friend to. And what does he do? Licks a doughnut.

Maybe some people are interested in Ariana's germs, but we for sure aren't. Check out the video here and see for yourself.