At the blood bank, the young prep nurse said, "Hi, how are you?"
I said, "Can't kill me if they can't catch me, you know how it is."
She did not smile or laugh.
Six months ago, at the IGA, a cashier asked the same question and got the same answer.
She looked at me, nodded, and said, "Damn straight."
@GeePawHill a Ukrainian friend told me the common response in his country is "better than I deserve."
I've been using it.