Yes, users ARE fickle things...
Two (personal) examples:
One: Our company installed terminals in answering services (in the 80's), and in those places the operators smoked like chimneys. The CRT terminals would attract the smoke and slowly deposit a layer on the front of the screen. We would go to the customer site, and with Windex in hand clean all the terminal screens. Invariably this would elicit comments like "Gee, it works much better now.", without comment about the lack of crud on the screen.
Two: Scene: A recording studio. One day a kid of one of the engineers is fooling around, and gets ahold of the Dymo labeler, and goes to town. He decides to label LOTS of things. At the time the TV show "Laugh-In" was on the air and one of its sayings was "Look that up in your Funk and Wagnalls" (a dictionary). So he proceeds to label a few things (dumb controls that do nothing) as "Funk" and another as "Wagnalls". Fast forward to another day, and another client at the recording studio. Some "executive" is in the control booth and spots the "Funk" control and says "Can I control the funk with this", and the bewildered recording engineer says (knowing the control's history) "sure". End result, a very happy "executive".
So, it happens ALL the time.