Get involvedpublished at 08:58 Greenwich Mean Time 22 January 2015
From 19:30 GMT on Thursday, BBC Radio 5 Live are running a special programme to mark 20 years since Manchester United's Eric Cantona launched himself into the crowd at Selhurst Park.
It was a remarkable moment in time but what other incidents could be considered among sport's most shocking moments?
Let us know via #bbcsportsday, text 81111 (UK users only) or post on BBC Sport Facebook.