"Leap out and let it burn"
If I can tackle a small fire properly, then I'll tackle it, otherwise I'm out of the building with everyone else.
One time, I heard fire alarms in other parts of the building, but not nearby - and out of the window I could see thick, black plumes of smoke rising.
Okay, that looks like we have a genuine fire on site and the alarms aren't working properly - Out ! Out !! OUT !!!
Apparently, there was an alarm fault, and a power failure caused our ancient second-hand generator to kick in, hence the smoke - only three people headed to the emergency assembly point, while everyone else dashed to the machine room to check that their kit was still working.
I've also seen people start backups or wait for a clean PC shutdown when the fire alarms alarms go off.
One person even went to the tea room to make themselves a cuppa before evacuating, because they thought it was just a fire drill.