Proposition 65, California Health & Safety Code section 25249.6 et seq.

various credits on:
The Banished Vault
Arcsmith
John Wick Hex
Quarantine Circular
Subsurface Circular
Vienna Automobile Society
Sun Dogs
P&P microgames:
In the Court of the Skeleton King
The Garden
Tallships
Chicago
my fav prop 65 warnings I've seen (aside from all of the ones at the creamer/sugar bars at starbucks to warn you about the hazards of acrylamide in coffee) are the ones by the staff doors out onto the tarmac at SFO
Outside may contain carcinogens, watch out
my favorites are the ones at disneyland
in a former life i was in an office park in santa monica and was oddly pleased to discover a prop 65 warning at Every Single Entrance To The Building and also next to the elevator call buttons on every floor
does prop 65 even mean anything anymore to me it's basically just a "this product is cool" label at this point
Oooh yum, this reminds me that I've got a full jar of furikake waiting for me