Yesterday during work time last hour (my algebra class)...
A student walked over to me, handed me his planner and a pen, and asked, "Miss Grivna, can I go to the bathroom?"
I respond with my normal: "I don't know, can you?" Even though I'm a math teacher, I still prefer hearing correct grammar usage in my classroom.
"I'm not gonna say it."
Oh, two can play at this game. "Then I'm not gonna sign it."
"Fine. May I go to the bathroom?"
"Yes, you may."