Two's Company, Three's a problem.
One of our favorite episodes of Three's Company is when Chrissy and Jack join the Cult of the Liquid Brains and try to convert Janet. Between Janet's disbelief and refusal to join, their apartment mysteriously burned down that night while Janet slept. Jack and Chrissy were at the Regal Beagle during the fire and with no witnesses and a solid alibi the episode ended leaving Mr. Roper to clean up a large mess. It was TV Gold!