Butterfly in Shades of Gray. Fielding has a shotgun in his trunk when he and Columbo are alone on the mountain.

Not only that, but Columbo's plan to catch Paul Gerard with a poisoned glass of wine was risky. Suppose Gerard didn't want to take the chance of missing and poisoned all the wine.

"Columbo Goes To The Guillotine": now that was committing to his theory of the criminal's plan.

OMG Ted that was the ultimate chance by Columbo. I often wonder before he had E. Blake put the collar on him if he had not taken out the blade thus making both sides of the collar safe. But left the stickers on there anyway. I would never put my head on the chopping block just a catch a killer if I was a police lieutenant.

Just driving that car is risky enough. I suppose he could use his wife's once in a while but her car is "nothing special, just for transportation"