h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Hmmm. Shooting is not a very sophisticated or civilized way to kill a conversation. An definitely not descreet. I'll think of something else.

And the spelling isn't too spectacular

But might just do the trick - in a written conversation.

Eye supose libirul use of mispeld wurds mite doo the trik.

veel geev yu a konfirmateev anser to yoor sooposition thad grouss mispelding weeth emens probbabbeelliti wil termineyte a convirsasjon.

Or you could use words you only half-know the meaning of and put them into the conversation whenever it picks up and become interesting. Or does that technique belong to discussions in The Temple of Confusionism?

Actually, I think Confusionism could be used to kill a lot of conversations. The only problem is that once the conversation is killed, there is no more chance to confuse. The devout Confusionist attempts to keep the conversation going, so moderate Confusionism can be a conversation killer, but non-moderate Confusionism is a conversation reviver, much to the chagrin of anyone else participating in the conversation.