The elements
Take a raincheck
Postpone a plan
Full of beans
Lively and active
Lose one's head
Panic
Fit as a fiddle
On cloud nine
Very happy
A perfect storm
The worst possible situation
A piece of cake
Really easy
Agree
A dime a dozen
Something common
Run like the wind
Run fast
All wet
Completely mistaken
To go cold turkey
To suddenly quit addictive or dangerous behavoiur
Costs an arm and a leg
Very expensive
On the ball
Doing a good job
The ship has sailed
Too late
Put something on ice
Put something on hold
Bigger things to take care of
Two peas in a pod
Always together
Barking up the wrong tree
To be mistaken
Have no stone unturned
Look everywhere
Snowed under
busy
Putting all your eggs in one basket
Doing something risky
Back teeth are floating
Strong need to urinate
Off their rocker
Crazy
Not playing with a full deck
Being dumb