It was not meant to be humourous. Many countries have strange rules. In the navy we had briefings prior to going ashore. some said no more than 2 packs of smokes or no more than 20$ american, no carbonated drinks, no weapons or items that would be construed as a weapon no more than 2 days medicatons on you. . then of course that was followed up with the off limits establishments. Many countries are concerned about black market items. In the PI you could not have house hold appliances in your posession off base such as a toaster, unless you lived there. those items are on the contraband lists and their prohibited quantities.
BTW...what countries forbid travelers from bringing carbonated beverages through their customs/border checkpoints?
-Z