And therein lies many a problem!

WYWIWYS - What You Want Is What You See!

A classic example would be something like:

if( condition )
   action1();
   action2();

Because I wrote it, I know that what I wanted is for both action1 and action2 to be executed only if the condition is true - and this blinds me to the fact that that is not what I have written!

What I should have written is:

if( condition )
{
   action1();
   action2();
}