Italian phrases

I came across an interesting Italian expression in a book ('A glancing light' by Aaron Elkins) the other day: Non c'è di che. Before getting to what it means, let's talk about the pronounciation. A 'c' on its own (ie without a following 'h') is pronounced as one would pronounce 'ch' in English - here it sounds like 'chay' (as in 'chase'). 'Ch' on the other hand sounds like a 'k' (or a hard 'c'), so the idiom sounds like 'non chay dee kay'. What does it mean? Google Translate says 'Don't mention it'. But changing the preposition leads to some interesting results, and translating the resulting English back into Italian is even more interesting.

Preposition	Italian	English	Back translation
di	Non c'è di che	Don't mention it	Non parlarne
di	Non c'è di che, caro	You're welcome, dear	Prego caro
a	Non c'è a che	There is nothing to it	Non c'è niente di male
de	Non c'è de che	You have nothing to say	Non hai niente da dire
in	Non c'è in che	There is no way	Non c'è alcun modo

All of the above probably means that one shouldn't trust Google Translate too much, and that these expressions are more idiomatic than literal. The funny thing is that I can near enough understand the back translation without help (although 'male' means 'evil' or 'bad').

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