I may go a few days without getting a spammer or thief call. Like many, if I don't have the number already in my phone, I don't answer. I do have voicemail, I figure if it's important they'll leave a message.
Then, I do have my days, I'm human and will be the first to admit it. Sometimes I get fed up with these types of calls and the relief valve gets activated. Some get the message and hang up before I get the first sentence finished. Others, I may toy with right up to the point they think they've got a fish and are just waiting to set the hook. That's when I drop the bomb on them and finish the call with "Boy, does yo' momma know what you do for a living?".
Murphy