Watching people eat 'Spaghetti' is very interesting.
I've seen the following methods:
1. Cut Spaghetti with knife (American style aka fork knife switcheroo)
This method seems common for parents trying to 'feed' children
2. Cut Spaghetti with fork, they move a portioin to the side of plate and cut it
3. Twirl Spaghetti on fork with out the help of bread/roll or spoon
4. Twirl Spaghetti on fork with the help of bread/roll or spoon

I was taught #4 with a spoon.