Me: The scroll wheel on my trackball is flashing.
Tech Support: Can you use the mouse?
Me: Yes it works fine.
TS: Then what's the problem?
Me: That's what I'm asking you.
TS: I don't understand.
Me: The wheel is flashing.
TS: Why?
Me: I don't know that's what I'm asking you.
TS: What are you asking me?
Me: Why is the wheel flashing?
TS: Can you use the mouse?
Me: ... Yes. I can use the mouse.
TS: Then what's wrong?
Me: THE SCROLL WHEEL IS FLASHING
TS: Hold please.

<deep breaths>