Actress Hayden Panettiere didn't need much coaching to perfect a blood-curdling scream for new movie Scream 4 - she has been practising it for much of her life.
The petite star reveals her dad insisted she develop an eardrum-shattering yell - so that she could scare off potential attackers.
The former Heroes star says, "I'm a fireman's daughter... and he always taught me - because I'm such a small girl - that you always have to look like you have somewhere to be and someone's gonna miss you if you (don't) get there.
"He used to tell me all the time when I went to the mall with my friends, 'What do you do if somebody comes up and grabs you?' He taught me to scream, 'You're not my daddy, you're not my daddy'. So I had a lot of practise screaming, 'You're not my daddy'.
"Now it just sounds wrong... but I'm pretty good at screaming."