Found a baby red belly black snake on a building site a few years ago so thought i'd keep it, got a plastic fish tank that it promptly escaped out of, only to be spotted sneaking through the air brick under the bath. Well the mrs (who was absolutely pissed off at me for bringing it home anyway) went mental, I didnt know how to get it out so I tried smoking it out, chain smoked a whole pack of ciggies (i'm a non smoker) through the other air brick, nothing happened, I sealed one air brick up and taped a mesh bag over the other and bugger me didn't the little bugger come out and get tangled up.
Took it to a mate who keeps snakes, he let it go.
No snakes allowed in this house ever again