i’m just adding posts everyone else makes - i update it as people add materials; haven’t added stuff til you suggested it.
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There are a lot of things that you shouldn’t laser because of health hazards, but PVC has both the health thing going for it (won’t discuss the safety angle) and creates an acid that corrodes the laser itself. You should see my brother’s work laser. It looks like somebody dipped it in a salt bath for a month. Lots of rust and corrosion.
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I have been reading that PVC is bad for the laser itself but thanks for the vivid image of what that really means.
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Kittens. Never laser a kitten.
It’s not big and it’s not clever!
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Ive seen no evidence to suggest that kitten fumes will be harmful to me or my laser… lol
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also yourself, even when here in the forum there is a video is a video of a cool laser tattoo. 
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Yes but as I said if you have vacuum extraction to take away the fumes before they can hit the metal parts of your machine, or poison you, then PVC can be laser cut. Specialist commercial machine do cut it.
http://www.bofa.co.uk/lasingPVC.asp
So yes, don’t cut on on a Glowforge, but not correct to describe it as “definitely not laser-able”.
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Can probably can add “small children and pets - NOT safe to laser” 
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And puppies, please!
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No, you can laser puppies. Especially chihuahuas.
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Mmmm… maybe without the tray…
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…even though it’s days later.
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It took him a while to walk here!
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Ooh! Can I laser Gingy?
Anyone know anything about ABS specifically an otterbox phone case? I keep reading conflicting information. One said cyanide…
The SDSs that I have seen all mention hydrogen cyanide.
What does that mean?
We’ll take that as a “NO” to laserable… Although the part “… It interferes with the normal use of oxygen by nearly every organ of the body…” has me wondering what organs it can’t affect !!(The organs that laugh in the face of Hydrogen cyanide as they use their oxygen normally.) 
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