Scarlett Johansson thought she could ''take down'' Chris Hemsworth.

The 30-year-old actress has developed ''an inflated idea'' of her own strength since playing Black Widow in the 'Avengers' franchise, and tried punching her co-star - who plays Thor - in the arm, to try and knock him over while they were on set together.

Scarlett said: ''I have an inflated idea of my own strength now (since playing Black Widow). I remember standing beside Chris Hemsworth and punching his arm and beating his stomach and I almost felt like I could take down someone of his size. I feel I could take on anyone in the street and that is ultimately going to get me into trouble!''

Scarlett also admitted that it's not just her lack of physical strength that differs from her 'Avengers' alter-ego, but also her mental strength, describing herself as ''hyper sensitive''.

Speaking to Britain's OK! magazine, Scarlett said: ''I'm hyper sensitive. She has to remain distant and grey in some way. I'm not that way, I don't think.

''I'm not a tomboy but I'm not a princess. I don't really think of how I am, or how I come across, to be honest. I'm just Scarlett, and everyone is who they are.''