Will Smith's superstar kids JADEN and Willow were left stunned by one desperate fan who asked them to sign their names in her own blood.
The girl didn't have a pen when she bumped into the siblings, aged 12 and 10, and so she got resourceful.
The Karate Kid star Jaden says, "She was like, 'I fell and cut myself, but can I have your autograph?' I was like, 'Do you have a pen?'"
Willow adds, "She was like, 'Sign it with blood'."