Tell me again, why do I need one of these things?

dosk: if Microsoft wasn't based at Doskland, I could hit them with an IBM
buzzy: I C B M; you're missing a C
dosk: not neccessarily
buzzy: so you would launch an International Business Machines at them?
dosk: yes, with a catapult
dosk: trebuchet

...
dosk: you know ICBM's have another name?
buzzy: so?
dosk: one button spam filtering; enter the spammer's IP and...