Diarrhea. It will get you out of anything, including high school
classes. No one will argue with you, or question you further.
(a teacher and a student)
T: I'm going to write you up for skipping my class again!
S (in a hushed voice, The Excuse): ummmm....I couldn't get off the toilet...I
point the teacher dosn't want to listen
anymore, and pretends to be busy. you walk away in sucess)