Joining in with the fun is Dr Tim Crick,
and this is his weekly session of laughter therapy at Leeds City Hospital.
The aim of these 30-minute is not only to help patients forget that they sick,
according to Dr Crick Laughter gives the lungs and the muscles a good workout,
which important in long-term patients.
But more than this,
believe that laughter can actually speed up recuperation from sickness.