Reminds me of a local news story from this summer...Ford Windstar van, front passenger seat replaced with an armchair. Problem was there was no seatbelt and it wan't bolt in if I recall correctly (I'll see if I can find the story). I forget the reason for the roadside attention by the local constabulary, but it was not related directly to the armchair...happy coincidence?
Beanbag chairs in cars...definitely Darwin Award Nomination material!