I'll admit it: my first time was pretty awkward.
We were on a weekend trip to Monterey, and part of that plan included a stop at the Gilroy supercharger on the way home to "fill up the tank." I carefully backed into the stall, proud of myself for maneuvering the car so effortlessly with the help of the backup camera, and being all ready to head straight out when it was time to leave.
There was only one problem. This was a stall with the supercharger pod located toward the front (aisle) rather than the back (curb). For whatever reason, I imagined the cable was UMC-length, and that it retracted into the supercharger pod and I would be able to extend it. So I try to pull on the "hose," expecting some longer spool of cable hidden in a recess of the pod. And... nope. It didn't get any longer by tugging it. What you see is what you get.
There was nothing to do but get back into the car, pull out with all the other owners watching me and smiling, then turn around and come in again.