It's funny because when I was a university student I had only a vague idea that a Negroni was equal parts Campari, gin and Vermouth. I did not know which vermouth exactly, and I couldn't be bothered to check, so I would often just make it with Martini bianco (commonly found in Italian supermarkets) and thought it was great.
Now my taste is a bit more refined and I do prefer the original version. Still, this combination reminds me of when I was young and foolish!