Keira Knightley has developed an irrational fear on film sets that reduces her to a crying wreck - firing fake machine guns.

The British actress discovered her weakness while shooting upcoming movie DOMINO - which centres on the real-life story of model-turned-bounty hunter DOMINO HARVEY - when she fell to the ground in tears.

And bizarrely Knightley can offer no explanation for her firearm phobia.

She says, "I hated firing the machine gun in Domino. I burst into tears. I fell to the ground and couldn't get up. Don't know why. I know they say when you experience something like that, it's like falling off a horse - you should get back on it.

"I have fallen off a horse and I didn't get back on. I'm scared of horses - I thought, that thing didn't want me on its back. I get that. I just don't need to get back on."

09/05/2005 02:21