I am sure I've seen some of them in shops here recently. The packaging looks different, it's orange all over with yellow writing, maybe they are a different thing?

I'm a fan of peanut butter, but lots of people I know are not, still I think it would be a cool thing to bring, along with boxes of twinkies. I have no idea what they are but always wanted to try them since I saw them on Ghostbusters (as already pointed out) as a kid.

One American thing I'd also like to try is a slushy. We have them here, just not the scale you seem to have over there. I also imagine that the burgers are made with this same multiplier in mind, but that could just be wishful thinking

Cheers

Cris.

Edit - I think I should point out I am not saying taking a slushy on a plane it a good idea