Yes, the backward, upside-down, mirror reading may be something a lot of us have in common, as well as, I'd assume, rapid reading. Do any of you get in this awkward situation: you're at an opera or movie with subtitles, and you laugh instantly when a joke comes on the screen; then the rest of the room laughs a second or two later? It feels like showing off, but you either have to laugh quietly or not at all to avoid it.
P.S. Not a leftie!