This may not exactly be fooling the user but......
I used to be the Network Manager in a large business full of knobhead managers.
When machines were “not working” it was often the fault of the knobhead who could not use the software and whoi chose not to learn properly. This type of person always blamed the machine or the software.
My technician used to be bullied/harassed by them constantly – especially if he could not fix “the problem” on the spot.
Even I found it difficult to deal with some of these knobheads because of their seniority in the business.
My technician and I developed a strategy to “get revenge” on the knobheads.
When a problem occurred the technician used to ring me and say either “There is a nug” which meant Non-User Generated. We used to do our best to fix the problem on the spot or ASAP. If on the other hand he said “There is an ug” (with a slight pause between the an and the ug). This meant it was User Generated. (Although the grammar was a bit off.) He only did this if the manager was being awkward and harassing him. In such cases we “confiscated” the manager's computer saying it would take a couple of days to fix. In such cases we simply left it on the shelf for a day or two.
The said manager would then have to scurry around colleagues for a day or two because his won computer was “hors-de-combat”.
Biting the hand that feeds IT
