I spent some time last night with a room full of Australians going through a list of differences between US and Aussie English. They seemed to get a kick out of the fact that USians refer to "bum bags" as "fanny packs." The real winner for me is the fact that Aussies refer to potted plants as "pot plants."
I keep imagining the poor people who innocently ask US Consular or Customs officials if they are allowed to bring "pot plants" into the US.
I asked the Aussies what one would call a potted "pot" plant. They seemed to be struggling for an answer.