| http://www.w3.org/ns/prov#value | - This can be tried in real life, although it should be noted that helium displaces oxygen in your lungs, so breathing it too long can be harmful.Gasses that are heavier than air, such as sulfur hexafluoride and xenon, have the opposite effect, resulting in a temporarily evil- or gruff-sounding voice, but this rarely appears in fiction probably because the gas is less widely known.
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