A colleague once turned almost green in the office and complained of chest pains, so I dialed 911. Emergency services showed up within minutes, but I didn't think of aspirin.
In the end it wasn't a heart attack, but I still reckon I did the right thing. Security in the building was very helpful (they saw the fire truck arrive, of course), and told me that I could always ask them to call if there was a next time.
Sure, and waste another 60 seconds while I explain what's happening? I'd sooner call myself.
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Zero gallons to the mile