The Importance of Humour in Mission Impossible

The movie is quite funny. There's lots of really laugh out loud moments in it and especially the relationship between the Ethan Hunt character and the Grace character. They have a real chemistry on screen and create a lot of laughs just with their glances at each other but there's also moments where sound can create a laugh. You're expecting it to be this amazing super high-tech car and it ends up being a very tiny Fiat - for sound wise it's rigged to be a modern car even though it looks old. The challenge was how small can they make it, how feeble can we make it without it being unrealistic?