for years, having been brought up catholic , I used to have to bless myself to figure out which hand was which ( caused some startled looks in certain situations like my driving test I can tell you)till my son pointed out that your left hand naturally makes an L-shape if you hold it out palm away from you.
Of course, I am also brilliant, intelligent and good -looking......ask anyone......except Micca......and Liz......and..... oh bugger!