I wrote some ambiguous English (and don't we all?)

I like to point out other people’s malaprops, so it’s only fair to report that I experienced some confusion of my own making. Computer Support at work called a little while ago to tell me that my two mice were ready. Mice? I didn’t request any mice! Puzzlement and deep thought ensued
…
I’ve just moved into a new office. It’s important for me to keep my shoulders down, else they hurt a lot. I use two computers; I need the keyboard and the mouse pad to be lower than desk level; so I ordered dropshelves for two keyboards and two mice. (Maybe I should have placed a colon between “for” and “two” …)

By the way, I will be posting irregularly for about a week.