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We used to change people's colour schemes to white text on white. Or if we knew they'd had a heavy night before we'd change the whole colour scheme to what can best be described as "angry fruit salad"
In one job one person insisted she could move her PC without any help - she was actually quite obnoxious about it. So we let her move it, then had someone call her away before she had chance to check it still worked. We powered it on, turned the contrast and brightness right down, then turned it back off again...
Same company, we set up mental phone loop. Mental because the system we had at the time couldn't easily be set to divert to another phone. It could be set to display a message to an internal caller to call a different number instead (it would still call the original number whilst showing the message). It took longer than expected for the person who wasn't in on it to work out what had happened.
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