General Zod
TGT Addict
A mutual friend of ours consistently answers robocalls the same way. "You sound really nice. Tell me, do you swallow?"
They always hang up on him. They seem to call back less.
Personally, I can't bring myself to do what he does but I have to admire the apparent effectiveness of the tactic.
I got a hang-up by answering, saying "hello" so I could be sure it was a person, and when they said "Hi, this is Michael with-" I cut him off and said "Boxcar. Juliet. Paintbrush. Provide the countersign, please."