Dark horse
Red herring
Let the cat out of the bag
Barking up the wrong tree
Let sleeping dogs lie
Kill two birds with one stone
Hold your horses
"Beating a dead horse. Making too many references to something, often a joke, that people are tired of and don't want to hear anymore. Oh my God, man, why does Hollywood keep putting screaming goats in their movies? The meme's like 14 years old. I mean, talk about beating a dead horse."
Beating a dead horse
Bee in your bonnet
Ants in your pants
Rabbit hole
Rabbit on
Sacred cow
Guinea pig
Lab rat
A dog's dinner
The dog's bollocks
The dog's
Fit as a butcher's dog
In the doghouse
The cat's pyjamas
The bee's knees
Wild goose chase
Early bird
Night-owl
Bookworm
Slippery as an eel
Like a bull in a china shop
Chewing a wasp
Pig out
Wolf it down
Scaredy-cat
Copycat
Cold turkey
Pigeon pair
Moggy
Earwig
Earworm
Twitcher
Hen do
Stag do
Galah
Drongo
Budgie smugglers
Hen
Duck
Bird
Feeding frenzy
Get my goat
"GOAT, an acronym for greatest of all time, can also be used as an adjective to say someone or something is GOATED and is also often used in hyperbole to say something is really, really, really good. Did you see Mighty Mouse's flying armbar against Ray Borg? Oh, he is the GOAT!"