Though I wasn't there myself, one of my former colleagues was a writer at the fight between Bradley Pryce and Gavin Downs at the York Hall in Bethnal Green.

Basically, Bradley stopped Downs in 9 rounds, but after the fight, his brother was so happy, and was watching from the balcony that he jumped into the ring and broke his leg after the 12 foot leap. Seemed pretty bizarre to me, though rumour has it he was pretty wasted.

Anyhow, couldn't find the full article, but here's a link to the preview of it:
http://www.encyclopedia.com/doc/1P2-3310862.html