Teta's Adventures Vol 5

In Teta's Adventures Vol 5, four boys play a Halloween prank and find it not so funny. They end up doing some work to make up for it. How did they get caught? Teta helps out with solving this. Two girls laugh at a different cow but find it nicer not to notice the fault of the cow. When the three cows are together something happens to them which lead to a good result for a boy in a wheelchair. Stephen takes Teta to school for a brain wave test but it doesn't get done as something else happen...