a desperate person is willing to try measures that are unlikely to succeed to get out of trouble. Similar to desperate times call for desperate measures

ready, steady, go

angry and impolite words lead to angry and impolite replies; what goes around comes around

how do I get to the airport

the person who has the qualities implied or stated in a derogatory hint made by another one will complain of being insulted, regardless of whether the hint was directed towards them, (close to) if the shoe fits, wear it

(simile) avoid something like the plague

where there is a will there is a way

workers of the world, unite!

it goes without saying, needless to say

all that glitters is not gold