Here’s a favorite joke from one of my student films–
PRESIDENT: I want the file by oh-twenty-four hundred hours.
CHIEF OF STAFF: Sir, twenty-four hundred would require a twenty-five hour clock. We’re not on metric time, here.
Imagine my surprise when I was filling out my time card the other day. I had worked the late shift, from noon to half-past midnight. Time cards are usually done in military time, so I wrote my outtime as “0:30.”
My boss came in a little while later, and told me my time card was filled out wrong. “We use military time on the time cards.”
“…Yes. I did.”
“So your out time should read 24:30.”
I couldn’t believe it; I actually got to quote myself: “Um, 24:30 would require a twenty-five hour clock.”
She still made me redo my time card, but I felt it was a moral victory.