One wrong breath - let alone move - and there would be an awful lot of sweeping up to do.
This is Philip Osenton as he broke the world record for the number of wine glasses held on one hand.
He went on to balance 51, far surpassing the previous record of 39.
The 43-year-old British wine consultant, who works in Beijing, said he learnt his art when he was head sommelier at the Ritz and the Savoy in London.
'The carrying of glasses is a sommelier thing. When I was head sommelier at the Ritz hotel, I’ve had a 140-cover restaurant to set up in the morning between breakfast and lunch, so basically with two glasses per setting I had got 280 glasses to put out with a very short amount of time.