What were the reasons the five students in the 1980's movie 'The Breakfast Club' had to stay for detention?

Bender: pulls a false fire alarm
Brian: flare gun goes off in his locker
Andy (Andrew): tapes a guy's butt cheeks together in the locker room
Claire: ditches class to go shopping
Allison: didn't do anything, she didn't have anything better to do on a Saturday

http://www.imdb.com/title/tt0088847/trivia

Claire Standish - Molly Ringwald - Skipping school to go shopping at a mall
Andrew Clark - Emilio Estevez - Taping a fellow student's (Larry Lester's) buttocks together
Brian Johnson - Anthony Michael Hall - Bringing a flare gun to school (in a parasuicidal gesture) that accidentally discharged in his locker, causing minor property damage
John Bender - Judd Nelson - Pulling the fire alarm.
Allison Reynolds - Ally Sheedy - Nothing better to do (according to her)

https://en.wikipedia.org/wiki/The_Breakfast_Club