either that, or people who have terrible timing with their texts.
I remember having a co-worker text me something about what do to about a certain task the night before work, and I text him back with an appropriate answer. He hasn't replied for hours, so I thought he just left it. Meanwhile, just when I'm asleep that night, my phone vibrates (mine vibrates real loud for some reason), I wake up and pick up my phone because it may be something important, and nobody really texts me at that point of the night. I read the text and all it says was
"K" 