Sandwiches taste better when sliced on the diagonal.

...but they're more filling when sliced horizontally. And slicing a sandwich vertically is just, well, icky!

Hammers will always fall upon your foot

Bartlett's Maximum Impact Hypothesis says that this is true *unless* there's something far more valuable or fragile within range.

My immutable truth - anyone can dance like Michael Flatley. All you need to do is have bare feet and drop a sharp knife, chisel, hammer, etc by accident.

Graham.