They might not always be normal and they are certainly not always rational but we all have our superstitions and strange habits.
As author and journalist Chas Newkey-Burden has found, that applies to famous people too. Here are 10 habits adapted from Newkey-Burden's new book Get Lucky: Rituals, Habits and Superstitions of the Rich and Famous.
1. Marilyn Monroe
Shaved the heel of one shoe in each pair to give her that famous walk.