Maybe all y'all do, but hey - I've owned this gun since '99, and I wasn't aware of it.
With a Series 80, if it's on half cock, and you pull the trigger, the hammer falls.
I was reading Jerry Whats-his-name (long name, starts with a K) book on working on the 1911. He says that, before working on one, go through this checklist, making sure the gun is in working order.
One step was to "put the hammer on the captive half cock and pull the trigger". Nothing should happen. Then it says the Series 80 guns don't have a "captive" half cock, and pulling the trigger will ease the hammer off. Says it is designed that way. "Captive
"Ease the hammer off?"
So I get out my one Series 80 gun, and after making sure its empty, I put it on half cock. Well, it ain't really "half cock", 'cause it's way too far forward. More like the "safety notch" on a Single Action Army, but Colt says it's "half cock", so we'll go with that term. Anyway, I put it on half cock and pull the trigger.
Glad I read that before finding it out by playing with it. I'da thought my gun was broke.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.