A really bad idea:

This.

Why: First, a lot of people - especially ones you don't know that well - will be grossed out if you up and hand them a slice of meat. Second, wallets are warm places. Those business cards are gonna start getting smelly and bacteria-y. Not only will your smell drive away some potential business contacts (or pretty ladies), but if you actually manage to hand someone the card, they'll probably get sick and die shortly thereafter. Of course, there might be one person who won't be driven away by your smell, won't die from bacteria exposure and won't be grossed out by you handing him or her a slice of meat. But the type of person that wouldn't be grossed out by that, who would find that sort of thing fun and/or respectable, is also exactly the type of person who would eat that business card, thus losing all of your contact information. Fail.

Then again... meat and lasers...

OK, I'm buying some of these. And then I'm gonna make lots of friends at the "Star Trek" opening !