Light switches and steering wheels never work properly in my dreams. I have to concentrate really hard to get things to follow the rules. Then I wake up.
Nope, nope, nope. Light switches never work properly in my own dreams either, but I find that testing the lights or just even noticing they aren't working is a guaranteed one-way trip to night terror land, even in adulthood. Not even realizing I'm dreaming is enough to stop it at that point.