My Post Office has self-service tills as well as cashiers. When you use self-service to send a parcel there is a screen asking if it contains any prohibited items - all fine - select 'no'. But when you use the tills, they always ask what's in the parcel.
Does anyone find this a little bit Stasi like or is it just me? I try to spend my time while queuing thinking of the most generic word possible for what I am sending. Occasionally I forget and blurt out what it is - recently this was body massager (don't ask!) which I am sure amused the cashier a bit.
I just don't know why they can't show you a sheet with the stuff you can't send and ask if the parcel contains any of those things as per the self-checkout.
I have a theory they do it for fun to see what the most most random thing anyone has ever said when they asked the question.