Potty time?

I gave a test about congruent triangles in Geometry today. Here's a conversation that happened in the midst of 3rd block:

boy: Ms. Ebberts, can I go to the bathroom?
me: Sure
boy: Uh, can I take my test with me so I don't waste any time?
me (trying to keep a straight face and not laugh at this boy): no

It was really hard not to laugh since all my kids were focused on their test and very quiet and I didn't want to be the distraction. It was equally hard to keep an unemotional face as the boy returned from the restroom a while later.

He was the last student in the class to finish the test.