Protest can take many novel forms. The most common form of protest that people in jail employ is the hunger strike, whereby people start indefinite hunger strikes or a group of prisoners go on a relay hunger strikes, with the expectation that such a step would force the authorities to agree to some of their demands. In some cases, this works, and in other cases, people have died with hunger strikes in jail.
In some other cases, the protest by prisoners takes a more violent form, with prisoners going to the extent of a riot in jail, sometimes causing riot police or the army to step in to stop such riots. However, in recent times, protests are taking on more unusual forms, such as this case where the prisoners sewed their mouths shut (link to article):
Over 400 Kyrgyz prisoners stitched up their mouths Tuesday as part of a nationwide hunger strike that has spread throughout the country's pre-trial detention facilities, Kyrgyz human rights ombudsman Tursunbek Akun said.
The protest follows a riot in mid-January during a routine cell check in one of Bishkek's pre-trial detention centres, when inmates started a fire and some slashed their wrists, protesting violence from the prison staff and visitor restrictions.