change horses in midstream to make major changes in an activity that has already begun; to choose someone or something else after it is too late. I’ve already started reading Harry Potter and can’t change horses in midstream to read DIVERGENT.

expressing complete surprise or disbelief I’ll be a monkey's uncle! I’ll be a monkey's uncle! I would never have thought that our team would win the gold medal!

a pig in a poke something that you buy or accept without first seeing it or knowing what it is like, with the result that it might not be what you want Buying his new CD is like buying a pig in a poke.

CAT IDIOMS Honoring Dr. Seuss and the Cat in the Hat Feb.24-28

Smiling like a Cheshire cat Smiling broadly (from grinning cat in Alice's Adventures in Wonderland.) He stood, smiling like a Cheshire cat, waiting for his weekly pay.

the cat is out of the bag- the secret has been made known. Now that the cat is out of the bag, there is no sense in pretending we don't know what's really happening.

Curiosity killed the cat. Being curious can get you into trouble. (Often used to warn someone against prying into other's affairs.) Why were you late this morning, Ms Hardiman? Curiosity killed the cat.

When the cat's away, the mice will play. When no one in authority is present, the subordinates can do as they please. When the teacher left for a few minutes, the children nearly wrecked the classroom. When the cat's away, the mice will play.