I had a banana in my carry-on bag, to eat on the plane, but I forget about it. Arriving at Customs in Perth, you are faced with big signs warning against the importation of many things, including fruit. Fortunately I was able to put the offending item in the quarantine tub before it was discovered. The import of alien bananas is considered a serious crime in Australia, punishable by imprisonment and/or a fine of $60,000 (I am not making this up). Good job they didn’t find the rhubarb I’d hidden in my sock.