No particular reason but I use couch. We call a vehicle with a headlight out a "popeye" For instance, There's a popeye coming.
When in public if one of us sees a person that looks a lot like a mythical character like Santa Claus or Rumplestillskin or even a famous person we simple say "It's a natural". A few seconds later when politely out of ear shot we compare notes and agree or not about who the person looked like.
Another term we use is rapster. We use this to describe a rapper that often seems to have run-ins with the law. It is a cross between a rapper and a gangster.
One more is the "review" mirror instead of rear view mirror. This came about when our daughter was very young and that is what she thought we were saying when referring to the rear view mirror on a car.