Are you kidding me? (Literally 'are you joking yourself out of me'.)
Mówisz poważnie?
Are you serious? (Literally 'are you speaking seriously'.)
Dlaczego taki poważny? / Dlaczego taka poważna?
Why so serious? (Adjective agrees with the addressee's gender.)
Niech pomyślę.
Let me think. ('Niech' + verb = 'let me/him/her...' — softening particle.)
Nie wierzę.
I can't believe it. (Literally just 'I don't believe' — short and natural.)
Na litość boską!
For God's sake! (Literally 'for divine mercy'.)
Jaka szkoda.
What a pity. ('Szkoda' also means 'damage/harm' — useful word family.)
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