One of the Quechua words cited in Table 1 in my Inca Connection post is genuinely related to something Indo-European (though not to what the Eurasiatic pseudo-cognate would imply). Which one? Please post your suggestions as comments below. I shall discuss the answers (if any) about this time tomorrow.
Oops, please ignore this challenge. I thought kuchuy 'cut' was somehow back-formed from kuchillu 'knife' (Spanish cuchillo < Lat. cultellus), but it seems that I was wrong: the verb is native and the similarity is deceptive, as in the case of English cook vs. cookie.