What were they thinking?

Ever read something that made you wonder what was running through the writer’s mind, or what caused their fingers to stutter as they were typing? I often notice typos in other peoples’ work (and miss them in my own), but I love this one:

usualibity, as in “…the Enterprise Edition can manage all engines at the same time, maximizing speed and usualibity.”

I presume they meant “usability” 🙂