One ad that sticks in my memory was for a pasta sauce (can't quite remember the brand - Ragu, I think)

The basic idea was that using this pasta sauce had the 'typical ad family' moving around the house, admiring the jar of sauce and singing some rubbish (in English) to a melody from "The Marriage of Figaro", the strap-line was:
"RAGU - Brings out the Italian in you"
So, we had a tune, written by a German speaker (Mozart), from an opera about a Spaniard (Figaro), based on a book written by a Frenchman (Beaumarchais) - and this represents making one more Italian?
The only Italian bit, the lyrics, were removed - Well done guys!