I was looking up some info on mailing something oversea's and ran into some restrictions...
I thought they were pretty funny.
So I looked up a couple more countries.. I found them
very funny
Fruit cartons (used or new).
Goods bearing the name "Anzac." 
Goods produced wholly or partly in prisons or by convict labor.
Registered philatelic articles with fictitious addresses.
Seditious literature.
Silencers for firearms.
Used bedding. 
Aerosol products.
Butane gas lighters and refills.
Perishable infectious biological substances.
Perishable noninfectious biological substances.
Polished, whitened, artificial, or imitation pearls. Horror comics and matrices. 
Obscene articles, prints, paintings, cards, films, videotapes, etc.
Seal skins except those from an accepted source.
Switchblade knives.