Last week the boys were on "fall break". Here's the conversation they had once they got off the bus on Wednesday.
C: "Guess what, M? We have four days off of school!"
M: "No we don't, we have three."
C: *getting indignant now!* "Nuh-uh! We have four! My teacher said so!"
M: *who's pretty exasperated at this point himself* "No, C. Thursday, Friday, Satur.....oh!"