a note on business cards

I travel often for work.. and with travel comes business cards..

I don't know why it is that people I meet on a plane or at project sites feel obligated to give me their business cards with their fancy titles and decorative company names..

being a consultant I'll be the first to admit, that I do carry my own fancy business card when I go on different projects.. but I use it sparingly, as needed..

At any rate, I accumulate a lot of business cards from random people I likely have no desire to contact in the future..
so.. what to do with these cards?

I developed a nasty habit of keeping these business cards with me, and using them as my own identity when I meet others. or submitting them at those drawings they often have at restaurants.... makes traveling more interesting.