Today, a student looks at the exam I just handed to him and exclaimed in unironic disbelief, "There's a hundred questions on this test?!"
To which I said, "No. I just haven't told you which 10 that you need to do."
Before I could get to my sarcasm sign on my desk (yes, it's a real thing), another student said, "Can you tell us which ten, so I can start?"
At this point, I held up my sarcasm sign. She then said, "You have a sarcasm sign?"
As I continued to hold up the sarcasm sign, I replied, "No."
Another student said, "You should put one up on the ceiling, so you can just point at it."
I replied, "That's where I keep the sign that says 'gullible.'"
They looked up.