'I've heard you're proposing this. It's a massive task, requires thousands of changes and a) isn't feasible in the time you seem to think it is and b) is pointless at this stage. If you want it, fine, it can be done at x point when similar changes are scheduled and can fit into the new structure as there are specific restrictions that mean x cannot also be y, for example. It's about 300 hours work and won't fit in with the other time critical tasks being done at that point, either. Oh, and if you do insist upon imposing this, I will be seriously reconsidering my employment - that's how much impact it will have.'
Goes quiet.
'Here's the spreadsheet of the changes, please do for Monday'.
<pause>
<read>
<blink>
<read again>
<go for a break to check thinking>
<read again>
<ask colleague if I'm imaging it or whether they have actually gone mad this time>
<thank colleague for confirming that yes, they have actually gone mad this time>
<go for another break to think of ways to tell them that they have actually gone bleeping mad this time without actually saying it>
'Here's your spreadsheet back with all the occasions highlighted where this inherently will not work because you've put x and y together in them. It will also determine f,g,h,k,t,v,w and half the Greek alphabet as well, what's more, you'll also have to get z to make multiple changes taking around 45 hours and deploy those 48 hours in advance, then once the changes are made, you'll need c,d and f to do around 30 hours of work between them in order to roll the changes out, plus create a new 10 hour task each for another 85 people in addition to completely changing everything they've done for the last seven months. Oh, and I'm not available to make those changes anyway because, as I told you, I have <these non negotiable tasks and deadlines> to complete'.
'Can you stay late for a meeting to tell people this and help them fix it for you to do it <ignoring the rest of the massive changes and workload it requires> tomorrow?'
'I'm off for five days as of ten minutes ago'.