A blonde boy always gets on the nerves of his neighbours. Old couple. And one day they have to watch him and they are having a party and he is inside messing around and stuff and then he takes off and gets kidnapped from an really nasty guy they sit under a bridge and eat beans and he messes with the kidnapper ao bad that he actually wants to get rid of the boy..

Sounds like this:
http://en.wikipedia.org/wiki/Dennis_the_Menace_(film)

Oops! I see that someone already has suggested the movie.