Columbo: You removed the bulb on the phone in the living room so the line wouldn't light up because if 6901 lit up the people there would know that you were talking from the phone in the study.
Janus: Guesswork, supposition, more cigar ashes. What you need is proof. That's what you need-- proof.
Columbo: It didn't take me 'til July but I got the proof.