I read from page 51 to page 68
the adventures of captain underpants
In the hallway George and Harold were laughing for a reason. their Principle Mr. Krupp walked into the hallway and saw George and Harold. George brang out the hypno ring and hypnotised him and started to play around with Mr. Krupp.
They changed him into a monkey,chicken and finally Captain Underpants. they laughed more than they every laughed in their lives.
They thought it was a joke but then when they noticed that it was a bad thing but they did it because in the last few weeks George and Harold haven't had any laughter. so they made Mr. Krupp look silly they thought was a joke but until he ran out the window they weren't happy.