CAN YOU KEEP A SECRET?
 

Don't let the cat out of
the bag.

A friend has just told you a secret. Then someone asks, 'What were you two talking about?' Do you ...
(a) smile and just say mysteriously, 'That would be telling'?

or (b) spill the beans?

Your friends are planning a surprise party for someone. Do you ...
(a) keep your mouth shut until
the party?
or (b) let the cat out of the bag the day before?

  That would be telling.
it's a secret

spill the beans
reveal a secret

let the cat out of the bag
give secret information too early