What I was going to say, before I was so rudely interrupted:
This is Gwen. She's not that smart, and she doesn't pretend to be. Several years ago she had some sort of liver disease, I believe one of the medications we gave her messed up her eyesight -- her pupils are over-dilated and it takes a couple of tries for her to find a partially opened door. Sometimes she runs into things, and she can be sort of timid about jumping down from the couch.
Gwen has a very bad habit. She pees on things. Only on soft things left on the floor or bed, like clothes*, towels, or our expensive-to-clean down comforter. We're pretty laid back, so that isn't a capital offense, but she is not allowed into our bedroom without escort (she does not do it when we are around, she is shy. Or something.) The problem is, because most of our heat comes from the wood stove in the living room, with the door closed, our bedroom is not heated, which makes bedtime very uncomfortable.
We decided the perfect solution to this problem was to put up a baby gate. The other two cats would have no problem jumping over it, but they don't have the Bad Habit. We thought there would be no way Gwen would be able to jump the gate, being pretty dim, timid and having little eyesight. So I borrowed one from a co-worker and Len installed it.
It took her two days.
*Personally, I would think this might be good incentive for Len to keep his dirty clothes out of the living room, but no. She doesn't pee on them often enough.