Is it really possible to die laughing?

Apparently:

In 1989 a Danish audiologist, Ole Bentzen, died watching A Fish Called Wanda. His heart was estimated to have beat at between 250 and 500 beats per minute, before he succumbed to cardiac arrest.

Reminds one of this classic, naturally. The catch is, I haven't been able to track down anything quite counting as a primary source (the Wikipedia entry on A Fish Called Wanda gives a reference, but the link is dead).