Yes!
Coming back from a walk, I went the campsite next door, which also contained a Phaeton with the same color scheme. I looked up and saw that the window shade on the door was down and thought "Wow...I don't remember putting the shade down when I left". Then I realized there was no "pet on board" sign in the window.
Ooops...wrong camper!
Now I always make sure to look for the one-eyed pink flamingo to make sure I'm in the right spot.
Pulled into the wrong site once also. Next to the one I had reserved. The people who had really reserved the site just happened to be right behind us. They jumped out of their truck looking ready for an argument since we seemed to be stealing their spot.