Downey Jr knocks down Sacrlett Johansson

Downey Jr knocks down Sacrlett Johansson

Downey Jr was wearing his heavy superhero suit while he was waiting to film scenes with Johansson.

"Robert triggered a switch that controls one of his arms - and it suddenly jerked backward and whacked poor Scarlett. Knocked silly, she staggered backward, then lost her balance and fell off the low platform they were standing on," femalefirst.co.uk quoted a source as saying.