Back when I was in fourth grade, there was a day when the teacher asked us to read about and learn Morse Code. As all the other kids in class, I quicly read it, memorized some of the signals and soon forgot everything. But, since you never know when aliens could suddenly attack Earth and cut out our communications ("Independence Day", anyone?), I thought it would be useful to remember how the hell to use it. So there you have it. o - o o - - - - - - -o - - !
~ o- o-oo o-oo -o--