Remember when we were all chucking ice cold water over our heads for a good cause?
This latest social media challenge is about keeping a little more dry. Yup.
The #JustATampon challenge is a campaign aiming to get people to share a selfie with a tampon to break the stigma around periods.
And it has taken off big time.
Stand up comic Jenny Eclair wrapped one on her ear.
C4 News presenter Cathy Newman gave hers a good dangle in front of the camera.
As did this person.