How can looking into a Dark Star drive you insane?

Its from Torchwood's Adrift episode.



For those who don't watch the show, a boy that got sucked into a rift in space and time at one point saw into the heart of a Dark Star drove him insane.



I thought looking into it would be an amazing sight, in a good way.How can looking into a Dark Star drive you insane?Nonsense! I've looked into a Dark Star and it never drove me insane. In fact looking into the dark star isn't the bad part. The bad part is looking into the dark star. ahhhh!How can looking into a Dark Star drive you insane?Maybe it just got stuck in his head like a song.