corking thread title!
I'm a bit of a boring bugger really because I'd have to say Gary Lineker's 'Roast Chicken' flavour.... or probably any roast chicken flavour come to think of it.
remember the 'fish & chips' and a lot of the others people have mentioned, but Monster Munch and the other extruded varieties whilst 'good' back in the day are sadly just full of MSG and so are more adulterated than the usual artificially flavoured 'gourmand' snacks, LOL. Skips were sickening before you even got to the end of your first packet.
British Airways used to give out the most delicious salt & vinegar pretzels (or something similar) that I'd cadge as many packets of from the trolley dolleys.
love crisps... sadly the Americans haven't quite figured it out properly.