Dealing with the 'class clown' during seminars - ideas welcome!

I have recently conducted a corporate seminar where I had to deal with a couple of giggling girls (actually they were women in their early 30’s believe it or not!) that threatened to turn the hypnosis session in to a disaster. They were two colleagues who giggled whilst I was trying to induce the group.
On the spot, the best way I could think of to deal with the interruption was to integrate the pair of gigglers into the deepener. Usually I try to make sure there is a manager of some sort in the group who understand that time is money, this usually makes subordinates behave. On this occasion I failed to do so.
During this seminar I dealt with the girls by stating that ‘laughter was a great way to relax and in doing so you would go into a deeper state of relaxation’. The gigglers soon drifted off. The seminar was a great success, but this has got me wondering if there could have been a different way of handling this and what other hypnotherapists do in similar situations.
I am always aware that most corporate teams have a ‘class clown’ who has a psychological need to make everyone laugh no matter the situation, and would like a varied tool kit to deal with this possibility. Has anyone got any elegant solutions to the disruptive (well meaning) person in groups? It is not the same as stage hypnosis hecklers where you can usually make them feel stupid, but the corporate client where you are trying to impress the corporation in order to gain referrals. The solutions need to be seamlessly integrated as not to embarrass or up set anyone.
Any ideas/expereinces would be interesting.

Thanks
Steve Mycoe
www.SportsHypnosis.co.uk
Join my affiliate program and gain 20% of CD sales.