Handy as a pocket on a shirt.
More Traditional Proverbs:
Silent men like still waters, are deep and dangerous.Traditional
A swarm of bees in May is worth a load of hay.
Traditional
Caution is the parent of safety.
Traditional
Pity the man who has a stranger's spancel on him.
Traditional
The road to success is lined with many tempting parking spaces.
Traditional
The cleverest doctor cannot save himself.
Traditional