What's your least used option?

Here is a different thread. What option does your TM have that you use the least? Not to dis anything in particular but just the way we happen to travel.

Least used for us is the TV antenna. Been used zero times. I usually bring a laptop which will play DVD's and has internet access. No TV.

Next is the generator. Not really an option so to speak, but I use it much more seldom than I thought I would. Long trips I often have hookups and short ones the dual 6V batteries last no trouble.

Lastly is the Air Conditioning. Seldom used but I wouldn't do without it. When I need it, I need it.

What's yours and why?