[johanbev]

> If you speak Dutch, you also speak accented Flemish and broken Afrikaans. If you speak Danish, you can also understand Swedish and Norwegian.

It is true that these languages are really close. But I woudn't say that danes in general understand spoken Norwegian or Swedish (though Norwegians usually do understand the others better). If you speak Danish as a foreign language, I'd be really impressed if you could have anything resembling a natural conversation with a norwegian or a swede.