By Jonathan Rawcliffe & Phil Harlow BBC Sport at The Crucible

Body language experts could have a field day at the Crucible observing players' behaviour between frames.

Terry Griffiths was not impressed

Players can look edgy or downright hostile, but few share a laugh and a joke as Ian McCulloch and Mark Williams did during their match.

But the bonhomie didn't go down well with commentator Terry Griffiths.

"What's all that about?" spluttered Griffiths. "Are they going out for a meal tonight or something? I don't like that at all." Very old school.

Quarter-finalist Steve Davis and his partner in punditry John Parrott took the TV cameras on a rapid backstage tour of the Crucible on Sunday.

The two whizzed around the theatre's corridors, peeping in the various nooks and crannies whilst describing each area to the audience at home.

Unfortunately, JP was in such a hurry to get round, he lost his bearings.

Intending to give viewers a glimpse of the press room, he got the wrong door, peeking into a broom cupboard instead.

Breaking off to win a level frame on a re-spotted black requires tactical nous and nerves of steel.

In their opening frame on Sunday, Mark Williams was put in by Ian McCulloch to do just that.

He went for the pot from the break off, missed, and lost.

Just minutes later on the other table, Stephen Lee attempted exactly the same trick. He also failed, with Peter Ebdon the beneficiary.

Could this double-black woe have been more than a coincidence? Probably not.