(no subject)

So I just bought a Thermos flask, and figured I'd actually read the instructions for once in my life, and um. Under "Use and Care": Do not look directly into flask when filling. o_O Note also that this sentence does not appear in either the Dutch or French versions of the instructions, and as far as I can see it's not in the German one, either. Is there something in Thermos flasks that could be lethal to English-speakers?