Colemanballs: The art of letting the words come out before the brain is engaged, made famous by David Coleman but with very able disciples in Kevin Keegan, Ron Atkinson, Terry Venables....in fact it seems endemic amongst the football fraternity.. http://www.footballsite.co.uk/Statistics/Articles/Colemanballs01.htm
One of my favourites was (by an unknown punter) : there's no-way the game will be postponed due to ice on the terraces, they've got underground seating
The batsmans holding the bowlers willy was a quality one and I remember the snooker once when the commentator said "for those of you watching in black and white he's snookered behind the green".