There's some piece of opera (O Solo mio?) I can never ever her without thinkinkg:

"Just one Cornetto!
Give it to me!
Delicious ice cream from Italy!"

And on a similar note I can never hear "Nessen Dorma" ("None Shall Sleep") from "Turandot" by Puccinni without remembering the 1990 World Cup for which is was the anthem. (And Specifically Ireland taking England down a peg or two in the first round)