Lol!! This thread is hillarous
Glad that rattle wasn't a big problem..
I had something like that, for a few days I heard a little relay unlatching something.. try to find it, but it was very incontinuous... ended up it was my Camera (Canon DSLR) laying on the passenger floor witch had the 'internal popup flash' button depressed and was trying to pop it out.. :P
Have a great day all