On “Eskimos have [many] words for snow”:

From Pullum’s The Great Eskimo Vocabulary Hoax:

[When you encounter this hoax,] don't be a coward like me. Stand up and tell the speaker this: C.W. Schultz-Lorentzen's Dictionary of the West Greenlandic Eskimo Language (1927) gives just two possibly relevant roots: qanik, meaning 'snow in the air' or 'snowflake', and aput, meaning 'snow on the ground'. Then add that you would be interested to know if the speaker can cite any more.

This will not make you the most popular person in the room. It will have an effect roughly comparable to pouring fifty gallons of thick oatmeal into a harpsichord during a baroque recital. But it will strike a blow for truth, responsibility, and standards of evidence in linguistics.