Alcohol -- not just booze to drink, but real vanilla (for baking/cooking); Nyquil and other over-the-counter medicines; etc...

Certain other OTC meds might be removed and checked if the local authorities are unsure what they are for

Pork and any products that have pork in them (though they seriously don't check labels here)

Porn movies

Sex toys (if they look realistic)

Certain books (one friend had books about Bahai religion removed from their shipment; I had a book called "Why I am not a Muslim" taken from a shipment because they said it was blasphemous; other friends had fancy museum/coffee table art books taken and black marker scribbled all over the naked statues in the pictures; another friend had a paperback mystery novel removed for checking because it had a Star of David on the cover artwork...all this just goes to show you the wide range of suspicious material that might get yanked from a shipment