the person who asked for the changes does get to go home on time but you don't
Hah, that will be the day. The change is logged as well as the forced override against our explicit advice with the name of the person forcing that change, and the network will fail just as we have leave the building and put our mobile on silent because they were too cheap to add a 24/7 clause to our contract.
If we need the overtime we may "discover" the panic messages later, come in on Saturday and maybe rig the access logs so we'll have worked on Sunday as well, but you can be damn sure that anything the board wants to play with on Monday will still have problems, and the name of the person who ignored the advice of us superbly qualified magicians/technical people is on record so no guessing what will happen next.
Generally it only takes two managers being demoted to car parking duties for the rest to get the hint.