Here, use a pen.

Me:  Andrew, you should use a pen to write your name on that poster for school.
Andrew:  I want to use pencil.
Me:  No, a pen will show up better.
Andrew:  I want to use pencil.
Me:  No, here's a pen for you to use.
(5 seconds later)
Andrew (crying):  Why did you make me use pen?  I spelled my name wrong!


Sometimes, I really don't have a clue.