Here are 15 tips that have helped me greatly improve my laughter practice over the past decade:

If you do this Consider this
Allow people to crack jokes or constantly make comments. Don’t engage 1-1 with individuals on this. Respectfully ask the whole group to not talk or comment, as often as is necessary. Broken record technique.
Allow silence or downtime. Uninvited silence quickly kills the laughter dynamic. Keep things going, especially if anything is awkward. Move on to the next exercise, and the next, and the next…until you find something that works. If you feel the need to justify yourself, simply say “I’ve changed my mind: Let’s do something else…” Work on your transitions between activities/exercises. Try to be as fluid as possible.
Allow those who don’t want to be there to participate No 3rd strike policy. Try your best twice. If someone still refuses to engage after the 2nd attempt invite them to step back and watch instead.
Argue with 1 person in front of others. If someone behaves inappropriately, lovingly say what you need to say to the group as whole and repeat as often as necessary. All will quickly know whom you are really talking to, but in a non-confrontational way. Singling out individuals focuses all of the group energy on that exchange and it is asking for trouble.
Avoid eye contact This starts with you doing it yourself. As much as you can find ways for people to make eye contact., e.g., have all move around one another, look at each other in the eyes as if these were a mirror, do an exercise in pairs or as a team, echo each other’s sounds and/or movements…
Be very silly from the start. Plan your sessions and stick to your plan. Always go from less to more: first safe, then playful exercises. Avoid anything that’s “way out there” for a while, just to get a different experience.
Don’t move. Get people to move around and interact one with another as much as is possible.
Force participants to follow specific directions. There is no set choreography. However people choose to practice an exercise is fine as long, as it doesn’t hurt or upset anybody else. Allow people to express their own style.
Force your laughter, loud. There is no need to strain or force out laughter, ever.
Give choices Choices confuse people. Give 1 idea of what each chosen exercise could look like, and allow participants to be creative with it.
Hide your feelings. It’s OK to feel however it is you feel. Your role is to facilitate a dynamic far more than it is to role-model specific behaviors. Be authentic.
Never give compliment Keep telling your participants how great they are. Say things like “Awesome! Well done! Very good! Brilliant!” etc. Recognize and praise others for their contribution.
Never remind participants to drink at the end of your sessions. Laughing dehydrates. It is recommended that all drink at least one glass of water after each laughter session.
No clear start and finish for each exercise You set the rules. If your group responds well to an exercise let it continue. When you believe it is time, stop it. As the session’s instructor, you are the one in charge and decide when to start and stop anything.
Talk a lot Talking distracts you and everybody else from the experience. Focus on doing.