well it's kind of sporting accident as it happened at the rugby club
on my stag night at the club (I was still playing in those days) I fell headfirst off a table while trying to dance in a pool of beer simutaneously taking my clothes off (Aye Ziggy Zumba for those who have been around rugby clubs).
headfirst meant face first and breaking a front tooth in half which I only noticed when I woke up the following morning with a raging hangover. otherwise, my face was fine - just half a tooth less in my gob.
and this "following morning" was the day before the wedding so I had no time to get a repair done and as a result all my wedding photos have me with a strange smile trying not to display my front teeth....
I still have the half tooth - but it's been capped for a very long time now!