In my culture, throwing China after someone leaves the house indicates your strong wish for them never to return back...:))

And yes salt in weddings! I've seen Rachel Ray throwing a pinch of salt over her left shoulder many times, while cooking, for good luck!

Oh well, may good luck come with or without throwing anything..:))

Chupa: call me Happy please, not HH (Her Highness!) do you wanna upset the First Lady??..:)
Salaam