Years ago I worked in a call centre doing technical support. Usually for dial-up internet providers.

I'll never forget one lady who called in. I don't remember what her issue was, but I started walking through troubleshooting:

Me: "Ok, please double click on 'My Computer'"

Her: "With my left mouse button or my right button?"

Me: "With the left button"

Her: "Ok"

Me: "Ok, now if you could double click on 'control panel' please."

Her: "With the left button or right button?"

Me: "Oh, yes, with the left button. When someones says 'double click', they are always referring to the left button"

Her: "I don't care, I want you to tell me every time what button to use"

So I did.

For the rest of the conversation, every single time I asked her to double-click on something, I would pause and say "With the left mouse button", as if that was something unusual. She complied, but I could tell by her tone that she was getting frustrated with it. She never said that I could omit the added instruction though, so I just kept going.

Eventually the problem was solved and we disconnected. Nothing came of it, but I hope the next support desk she spoke to didn't need to explain it to her again.