I am acquaintance-friendly to people who work in my office building, including and especially the security guy downstairs. You don’t wanna mess with the guy who can make it really hard for you to get in the building to go to your job. 
I smile and say hi or bye to him. If it’s a holiday weekend I ask him about his plans with family if it’s before the holiday or ask him how it went if it’s after. I only don’t talk to him if he’s busy when I’m coming in or leaving.
So I was really surprised when he started giving me the icy dagger stare/”fuck off and die” look last week.
I spent all weekend silently wondering why he was suddenly acting so pissy at me lately. Not just once or twice, but every single time I saw him. I even tried to say “happy weekend” to him on Friday but he glared at me then looked down.
All weekend I was waffling back and forth between confronting him vs. Just letting it go.
On the way to work this morning I decided to stop caring and assume one of the guys at work had slipped him $20 for an extended April Fool’s Day prank. Or he had been wronged by someone else and misremembered it as me having done it to him. Or I had inadvertantly done something to him I wasn’t aware of. Or he saw me talking to someone who treats him like shit and got mad at me for associating with such garbage… Or he just needed someone to hate on for absolutely no better reason than he learned the term “frenemy” that day and didn’t quite have the concept down.
When I got to work the security guy was pleasant as pie to me. No glare, just a smile and a glowing account of Sunday’s gorgeous weather. “Have a nice day” pleasantries were exchanged, and that was that.
Huh.
I’m sticking with the April Fool’s Day conspiracy theory.
What a waste of worry.
You were having a hard week last week, so perhaps you were interpreting whatever look he gave you through your own mood.
Or maybe he just had PMS. Or it had absolutely nothing to do with you and he was glaring at everyone.
But I’m glad things are back to normal. I hate thinking someone is pissed at me and I don’t know why!
I rarely find worry to be worth the time or trouble.
Unfortunately, it’s not always easy to turn it off.
Well, why did you pee in his coffee, hm?
It usually is, unfortunately.
Obviously, he’s been temporarily replaced with a malfunctioning android.
I think it’s human nature to keep on positive terms with the security guard in your building. He/she is the key to hassle-free entry and not having to put down your coffee to show your badge.