Adding vinegar to ready salted crisps.

[upsidedownwalrus]

Still, we have so many flavours, but you can't beat salt and vinegar. I get major cravings for them when I'm in China. I go and look at the massed ranks of weird Chinese Lays flavours, get tempted, then think "Nah, I'll save myself for the loveliness of salt and vinegar when I return home"...