A long long time ago...
I was working on the helldesk. We had a user constantly complaining about the performance of her (admittedly rubbish) laptop. Said laptop was plugged into a CRT monitor. As part of an office wide upgrade, one weekend we swapped her monitor for a 14" flat screen.
Cue an effusive email thanking us for upgrading her laptop - performance was "so much better". In fact we never had a complaint about the laptop again.