I always answer " Hi, how are you going?" if its an unsolicited time waster, they then need to say what/who they want.
If its a tellymarketer, I normally just vent all my frustrations on them. Its fair enough to try & get some thing positive out of the call. A friend of mine likes to carry on with a lot of jibberish talk that has them asking what language they are speaking.

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Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving