My beef du jour is people who don't listen.
Today, we had a work problem. All signs pointed towards a certain procedure not being run. When my boss and I asked the guy responsible for running that procedure, he swore up and down that he'd done it.
Me: Are you sure? Because I've checked the timestamp of the last time (JOB) was run, and it says last Thursday - not today.
Him: Nope, I absolutely ran it today. Look, I'll run it again if you like. There, it's done.
Me: Um, once again, the timestamp says last Thursday. Are you sure you're running (JOB)?
Him: Yup, I'm positive.
Me: You know, I've sorted all the jobs by their timestamps, and there's a job with a really similar name that was just run two seconds ago - are you sure you didn't run (SIMILAR JOB) by mistake?
Him: .... you told me to run (SIMILAR JOB), so that's the one I ran.
Me: No, I didn't.
Him: Yes, you did.
Me: *gives up* Can you just run (JOB), please?