If you think something will never happen or succeed, you can say that 'pigs might fly' (or 'pigs can fly' and 'pigs will fly'- the idiom is used in many forms)
If what someone says should be taken with a pinch of salt, then they exaggerate and distort things, so what they say shouldn't be believed unquestioningly.
('with a grain of salt' is an alternative.)
When someone is wearing a plastic smile, they are appear to be happier with a situation or events than they actually are. This is actually a description of the forced smile you might see in many photographs.
If you play ball, you agree to do what someone asks you to do, or to agree to work with someone in order to achieve something together (often negative)
If you play by ear, you deal with something in an impromptu manner, without guidelines or rules. It refers to playing music without using written notation.
If you play for time, you delay something because because you are not ready or need more time to thing about it. Eg. I knew I had to play for time until the police arrived.
Someone who gets a legitimate job which is the opposite of their previous one. E.G a computer hacker who then helps to catch other hackers or an ex-bank robber who then advises banks on security.
If someone is given a poisoned chalice, they are given a job or task which appears attractive but is actually doomed to failure or beset with problems that will damage their reputation or harm them.
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