The first one of these I can remember was as simple as..

Never Eat Shredded Wheat

When I was taught the points of a compass as a child, North East South West.

25 years later and I am still using them, I remembered one for maths from school...

Silly Old Hitler Couldnt Advance His Troops Over Africa

Last week I was doing lighting calculations without calculator or computer (a nightmare!!) where angles and distances of triangles are essential. The one above means:

Sin = Opposite over Hypotenuese

Consine = Adjacent over Hypotenuese

Tan = Oppostite over Adjacent

All of which are used in trigonometry to work out angles and distances in triangles

I love the way the brain latches on to these things!!