I have never had problems with TVs and computers, but mirrors have been pretty freaky to me at times.

Especially mirrors in the dark...I don't know if it's from too many horror movies or what but half the time I'm either a totally different person on the other side, or it's some horrific figure of me melting or covered in weird black stuff or completely see-though blue or some other thing.

Light switches are pretty notorious among lucid dreamers...always harder to get the lights back on! I eventually figured out something that has worked for me so far. Instead of flipping the switch or whatever...I clap my hands and imagine the lights use The Clapper.