<human>: This happened a couple weeks ago, but it was pretty funny, so I thought I'd share it.

I work at a local gym doing card checks for people who come into the building. It's a very easy job with little communication with the people who come in, so I often have a lot of time on my hands. Knowing this, my parents will often call me to remind me of things they need me to pick up on the way home, or when they will swing by to pick me up after my shift. Well, one day, I forgot to bring my cell phone with me to work. The gym had a phone that employees could use, so I told my parents to call it in case they needed something. Well, near the end of my shift, the work phone rings. I pick it up, and hear my dad on the other end. My dad and I have a running joke that when we call each other at work, we'll often ask each other dumb questions about something regarding our work ("is this blah blah department?", "who is this?", etc.). So I pick up the phone, and I hear him on the other end. "Is the gym still open?" he says. Laughing, I reply, "Oh dad, stop." There's a pause. "Is the gym still open?" "Yeah dad, I'm still at work, haha." The voice gets aggressive suddenly. "HELLO?! Is the gym open?!" My entire face freezes. This was not my dad. This was some old man, calling into the gym with a question. I stammer, "Uh, yes sir, we close at 8." "Fine then." The guy abruptly hangs up the phone, and I'm left feeling like an idiot.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Told a man that I thought was my dad calling into work to stop asking me a question. Was not my dad.