Invisible Ink

One of my students just told me that his essay wasn't handed in because his friend gave him invisible ink as a joke. What you would you tell him?

Yesterday this happened to me. I told him that in my twenty years of teaching that I had never had an excuse like that. But I decided to leave it up to my Facebook friends. Here are their comments.

1. that's a good one, I would ask to borrow it so you could give him an A for effort.
2. well, sometimes if you iron paper with invisible ink on it, it will develop....
3. I would tell him " go get a job ! ". Hi Ed, how do you do ?
4. give him style points.
5. Invisible or not, it was not handed in, so it is late and graded as such. I'm sure you receive papers that have visible ink and would be better if they said nothing at all.
6. Tell him that's a funny coincidence because right here in the grade book you gave him full credit but that must have been in invisible ink as well. Huh, funny thing.
7. Hahaha . . . nice one!
8. More believable if his dog ate it!
9. I like the Truckee's one eheh .. great idea !! How are you all btw??
10. I second Truckee's idea. Muy bien!
11. Truckee has the response that's best.
12. Ed ask him where I can get more invisible ink. I ran out of it and I need more for my office. My boss always falls for the invisible ink excuse.