Last time I went for a holiday in Phuket there was a group of ceca families on the boat going for pre-ordered seafood lunch trip. The guides started talking to each other and point them out. My Thai companion overheard and told me they were preparing for drama. These ceca families would typically order food for only half their group. When the food is served, they would all insist on a plate each, eat till full, then disperse like everything is normal. When challenged, they would argue they all are only a little, kids were not served, fish not fresh, not filling,and finally claim miscommunication with agent etc etc. True enough, there was a big argument between ceca group and restaurant during and after the meal. The Thais have their sop for this group now.