This was a very funny movie - one of my all time favourites comedies. If you have some exposure to Japan and Japanese culture it is all the more hilarious.
The first two reviews really cover this movie extremely well so I will not say much more. I too watched it on an Air Canada flight (YYZ-NRT), in my case on June 30th. I am sure that I was disturbing the neighbouring passengers with my outbursts of laughter. Unfortunately it is not on the play list for my return to Canada. I'm hoping that a subtitled version will show up in Canada or I may eventually have to purchase the extremely expensive (75$CDN) BluRay version which releases August 3 here in Japan.
As in most Japanese comedies I have seen, the characters are exaggerated, but in this case not beyond the reasonable, preserving a real human touch. It was especially refreshing to have an elderly man as the main character. Someone that family and others don't quite take seriously, not really paying attention to what he says. One of my favourite tiny moments is when he tries to give away what he is doing - that short scene is so true to life. I still chuckle when I think of it. I started telling my wife and son about this movie and they wanted to hear more and more about it, laughing all the time as I remembered more and more scenes.
Highly recommended - a great laugh-out-loud comedy with some heart.