I still remember my first internship in a pet shop. I was told to arrive at 7am, of course the shop was still closed at that time. I remembered that on the phone I was told that I'll have to go through the back door because of that, so I went through the hallway next to the house, just to find that there's a wall, and no way to get behind the house. So I moved back to the front of the house, stood there for another 10 minutes, even went back into that hallway to check that I didn't miss a door or something, before it occurred to me that there's another corner with another hallway on the other side of the building, which, unsurprisingly, I quickly figured out did indeed lead to the back door that I was told about.
I got there early enough so I didn't arrive late or anything, and I don't think anybody saw me standing there like an idiot, or if they did they never mentioned it during the overall very enjoyable 2 weeks I worked there, but how it took me 10 minutes to figure that out still baffles me, and the feeling of how I stood there, trying to figure out whether I incorrectly remembered the information I was given on the phone, still makes me feel really uneasy.