Well, I just found this page online with a bunch of entries of "MacGyver Tips"- some of them are quite cool, especially the one about remembering the days in a month with your knuckles! I always forget that (and the song! )
Check it out at
http://www.lifehacker.com/software/MacGyver/

Hmm, makes me wonder about how much stuff actually drifts around, because the number of days with knucklebones trick was something geography teacher showed us in 5th grade and that was way back when in Moscow. You start with the back of your left hand and move across. It is a neat trick.

I learnt it from my mother when I was a child and use it very often. It's a great reminder.

Ditto.