Years ago I worked on an old IBM Green Screen machine. It had these menus with numbered choices for different applications. One morning I get a call from the sales rep downstairs.

Rep: Option 4 is gone from my menu!
Me: Really? That's odd, I'm not aware of any changes to that menu. Let me pull it up on my screen. <tap tap tap> Yup, there's option 4, just like always. Maybe you're on the wrong menu. What's the name in the upper-left-hand corner?
Rep: <reads name>
Me: <puzzled> hmm... that's the right menu name... can't imagine why option 4 is gone. I wonder what else is different. What does option 1 say?
Rep: <reads option 1>
Me: Yup, that's right, what about option 2?
Rep: <reads option 2>
Me: No differences so far... what about option 3?
Rep: "Oh hell, THERE it is."

It's my all time favorite of ones that actually happened to me.

Knobley