Caller, "Can I speak with you for just a moment?"
Me, "Well, you're doing good so far and your moment is up. ...(click)..."
OR telemarketers
"This is so and so with such and such. I know you're busy so I won't take but a minute of your time. I'd like to tell you about this wonderful blah blah blah......................blah, blah.........."
And 60 seconds later just as they're about to finish, Me, "Well, it looks like your minute is up. Bye."