nice, i wish i could do that

Most of those require specific weapons, this particular graphical glitch allows you to tell what was a fake and what was honest with just a keen eye.
Anything to make this weapon less annoying to fight against when you're not a Pyro.

Well, there are lots of things that make it easy to know if a spy ded ringered. Candy cane's health kit doesn't drop, damage done isn't shown above them, "critical hit" thingy follows them for a while after feigning, jarate+milk, revenge and domination mess up, etc. etc. This doesn't really add much because a spy could be gibbed or vaporised (phlog set and lazor weps) and not leave a corpse.

And that's why all those cocky Spy mains should learn to use the stock Invis watch.

Yeah, there are a LOT of little quirks like this to the DR that can give the Spy away if you know what to look for and (are able to) pay attention. That's why the DR's effectiveness really plateaus as the skill level of your opponents' increases.

It is pretty much a human thing to hate one's own voice, i find mine grating too in some of my older videos with voice. Anyway as for the glitch, this makes recognizing a feign death easier. But it still is the get out of jail card we loathe so much.

Now you know. Go apply that knowledge in practice now.

Huh. Never knew that.

Pffftt, you gotta listen to mine.

Uhh... I dunno if my voice is nice... I would say it's not very good, to be honest...