1.I accidentally divided by zero and my paper burst into flames.

2.Isaac Newton's birthday.

3.I could only get arbitrarily close to my textbook. I couldn't actually reach it.

4.I have the proof, but there isn't room to write it in this margin.

5.I was watching the World Series and got tied up trying to prove that it converged.

6.I have a solar powered calculator and it was cloudy.

7.I locked the paper in my trunk but a four-dimensional dog got in and ate it.

8.I couldn't figure out whether i am the square of negative one or i is the square root of negative one.

9.I took time out to snack a doughnut and a cup of coffee. I spent the rest of the night trying to figure which one to   dunk.

10.I could have sworn I put the homework inside a Klein bottle, but this morning I couldn't find it.